True duals vs. Single-in dual-out

[TheChevyLives]

Sup fella's, Would yall go with true duals (all my buddys swear about) or single in dual out? Single in dual out would be alot cheaper and i hear it sounds the same. What would yall go with?

[Joe]

Depends on where you want your power, low-end or top-end.

[Jokeman]

Single in Dual Out, why cause.:D :rocking:

[Figment412]

True Duals, I just like them :rocking:

[Z71DieHard]

Jokeman,

Which gives you low end and why? Same for top...I've got the 5.7 and would like better performance across the RPM band.

[Jokeman]

Originally posted by Z71DieHard
Jokeman,
Which gives you low end and why? Same for top...I've got the 5.7 and would like better performance across the RPM band.
One word. Whipple!:rocking: :rocking: :read:

Truthfully I dunno.

[454ss]

True Duals :cool: :head:

[TheChevyLives]

which would sound better? are there any charactaristics of each?

[Rossco]

---Go with the single/dual, you will be happy with it. Also like mentioned about go with a whipple if you want full range power.

[bigred305]

True duals!!!! In my opinion they sound better than single in dual out....:rocking: :rocking: :rocking:

[dropd80s]

OK this is one of my biggest pet peeves. ture duals kick ass compared to the single/dual setup. Ive herd a set of dual flowmasters on a 94 w/ a 5.7 and it rocked. Sounded so so good. If you deside to run a single use a single inlet single exit. They sound a lot better than the dual exit. trust me. Duals I'de say 2.5" at the biggest if you have no cats, and 3" for the single/single.
My .02:D

[Speeder]

True duals, long tube headers, crossover. Best of all worlds. Even though ol Featherfoot gets impressive power from singles.

[BC Rod and Custom]

i picked up power across the whole powerband with my true duals and crossover pipe. next is headers.

[PDQ02rado]

Just had true duals installed using the Magnaflow X and 2-14" Magnaflow mufflers. My first venture from Flowmaster. For my taste it is next to perfect, deep, mellow at idle and normal driving but plenty of sound while the right shoe gets heavy. I like the almost total lack of in cab resonance because I spend so much time in the truck.

[PtownZ71]

true duals with x-pipe all the way!

[dhill_TX]

Originally posted by PDQ02rado
Just had true duals installed using the Magnaflow X and 2-14" Magnaflow mufflers. My first venture from Flowmaster. For my taste it is next to perfect, deep, mellow at idle and normal driving but plenty of sound while the right shoe gets heavy. I like the almost total lack of in cab resonance because I spend so much time in the truck.

I second this entire statement... :head:

70+ miles a day and I wouldn't trade my MagnaFlow X for 2 Flowmasters AND $500.

[EXTREME]

what the hell is the x-pipe .... i've heard two or three of you talking about it... can you guys get a pic or something up...

and i would go true duals, cause that's what i have, and like the most :)

[ibthumpin]

Originally posted by EXTREME
what the hell is the x-pipe .... i've heard two or three of you talking about it... can you guys get a pic or something up...

and i would go true duals, cause that's what i have, and like the most :)

It connencts the two pipes just before the mufflers. I dont know the exact theory behind this, but it enhances performance.
Heres what it looks like (on SShotrods truck)
http://sshotrods.com/myrides/gmc/145-4558_IMG.JPG

[PDQrado]

Purpose of the X is to simulate, as much as possible, equal length duals. On these trucks you cannot have two equal length right and left side exhaust, say like the Mustang and the X compensates for this. Tests have shown significant hp and torque gains. Will know more after I dyno again. Right now my seat-o-meter says I gained with the X. Viewing the picture in ibthumpin's post you will see the X is at the rear of the cab, my installer put mine right behind the tranny crossmember, about where the flange was on the stock system. He claimed it would be more effective there. The X is made by Magnaflow and can be found at their site, www.magnaflow.com

[EXTREME]

sweet, that's what i thought it was in the pic.

this is just my thought, but it seems to me that it would restrict air flow thus decreasing power.... but what the hell do i know.... preciate the info guys....

[Scooter]

how much is the X-Pipe?

lata scooter

[PDQrado]

Originally posted by Scooter
how much is the X-Pipe?

lata scooter

I paid $65 plus shipping for mine.

[Bob Dobbs]

I have true duals, running 2 flowmasters(2 chamber design). All piping 3" into 3" Flowmasters and 3" out. I have the 454 so, the small blocks should stay with the 2 1/2". Sounds awsome! ! !

:rocking: :rocking: :rocking:

[grendal]

It also depends on what year your truck is and what engine you have....

If your truck is a single-catalytic convertor truck (all 80's trucks up through 1995's and some others), then the only legal setup is going to be single in/dual out...

If you have a 1996-1998 Vortec 350 you can do "true duals" and of course if you have a 1999+ "new" model you can do "true duals" because all of these trucks have dual cats.

Without dual cats, "true duals" isn't possible legally.

That being said, I have to recommend doing it. I think the Magnaflow X-pipe is overkill. Just get the shop to weld you a cross-over a few inches before the muffler. This will cost you like almost nothing and will take care of the equalizing effect. Plus I really don't like how that Magnaflow X-pipe narrows down so much....

Also, go with 2.25" piping on a relatively stock 350 smallblock. Otherwise you will lose some low-end torque possibly. With 2.25" Flowmaster 40's, a small crossover ("H-pipe") just before the mufflers and tail pipes coming out the rear, I feel better throttle response and power at all RPM's... enough to make it worth it... along with the way cool sound! True duals sound is awesome.

-Michael

[Speeder]

I have to disagree with 2.25 unless you have a shop that uses a tue mandrel bending machine. 2.5 pipe gets narrowed down to 2.25 or less on the corners with the regular stretch bending. Otherwise I agree with everything else. Bassani makes a helluva X pipe, doesn't crush the exhaust down like that one does, but they are very proud of their work. Their X pipe, last time I checked, was over 200 bucks. Of course they only do full catbacks now instead of components so that sucks. They were the only source I had for the exhaust tips I like and now I can't buy them any more. :(

[Bob Dobbs]

Thank goodness my truck came with dual cats!!!!!!:D You can't beat that true dual sound. Don't forget the tips!:head: I have to agree with speeder, go with the 2 1/2 piping for 350's , unless it is mandrel bent.

[FeatherFoot]

I'm working on this look


http://us.f1.yahoofs.com/users/95f9bd2d/bc/PV+Stuff/new+stuff/A+new+look.jpg?bcLQ.38AEDilGX.q

http://us.f1.yahoofs.com/users/95f9bd2d/bc/PV+Stuff/new+stuff/from+the+rear.jpg?bcLQ.38AEWNWx8IZ

What do you think?

John

[FeatherFoot]

and this is what I do on week ends.

http://us.f1.yahoofs.com/users/95f9bd2d/bc/PV+Stuff/new+stuff/Other+projects.jpg?bcLQ.38Abfqp0Nps

http://us.f1.yahoofs.com/users/95f9bd2d/bc/PV+Stuff/new+stuff/Other+projects+2.jpg?bcLQ.38AAGhSJ75a

That's not me by the way.

John

[grendal]

that's the way the shop did mine (per my request) on either side of the factory trailer hitch receiver, with chrome tips....

The only bad thing is it sends all the sound straight back and you don't hear it that much inside with the windows up.

-Michael

Originally posted by FeatherFoot
I'm working on this look


http://us.f1.yahoofs.com/users/95f9bd2d/bc/PV+Stuff/new+stuff/A+new+look.jpg?bcLQ.38AEDilGX.q

http://us.f1.yahoofs.com/users/95f9bd2d/bc/PV+Stuff/new+stuff/from+the+rear.jpg?bcLQ.38AEWNWx8IZ

What do you think?

John

[Z71DieHard]

:D Featherfoot,

Looks good...Have you worked on the duals out to each rear quarter?

I just had mine done to the rear quarters...Seems to balance out the tone left to right and lets you hear it a little better than straight out the rear.:head:

[FeatherFoot]

I'm running my Thunder Tube and the tips you see are not tips but Harley mufflers and they are a little over bearing out the sides.

[Bob Dobbs]

Hey droped80s, what were you thinking with your Avatar? I can't tell how old that girl is, but she sure looks about 15 and very naughty!:naughty:

[Bob Dobbs]

Hey Dropd80s, what were you thinking with your Avatar? I can't tell how old that girl is, but she sure looks about 15 and very naughty!:naughty:





http://imaget.webphotos.iwon.com/1000034064/1000034064_314200274500PM8.994693E-02.jpg

[Justinb]

i need help i went the true dual route with two single camber flows and x-pipe and have it existing at 45 degrees on both sides in the back, and let me tell you the sound SUCKS can barley hear anything if i cut off the rear pipes and dump it right after the mufflers will get the sound im looking for or do i need to rip the hole thing off and go back to a single 3"pipe instead of two 2.5"pipes please help

[grendal]

If you dump it under the bed it will be quieter outside, but louder in the cab.....

:(

Is it just really loud or does it sound like bad?

For some reason earlier I thought you had an old-body truck. Didn't realize it was a 5.3... IMO it takes a little more to make an LS1-based vehicle sound as good. They have a higher-pitched sound than the old-style V8's. My last vehicle was a 2000 Z28 so I'm familiar :P

Anyway, so you have duals with an X-pipe and its really loud... You could probably fix your problem with a set of 40-series mufflers instead of those single-chambers.

Any other specific things that sound bad about it? Maybe some other piping issue?

Good luck,

Michael

[Justinb]

no its too quit it:(

[grendal]

I assume you mean to quiet? :D

Anyway... I dunno what to tell ya. Those 1-chambers barely muffle at all, maybe you should do cut-outs.

-Michael

Originally posted by Justinb
no its too quit it:(

[EXTREME]

i have a little question?

which muffler is deeper? the 30 series or the 40 series? not louder but that deep rumble sound? i'll be running duals exiting out the rear and maybe 45 out the side.

[Z71DieHard]

50 series are the deep bass sound that is not too loud, but will definitely make the truck sound like it is on steroids.

Be sure to have the muffler mounted as far back as possible. If you can get it 4-6 inches behind the cab/bed gap, the resonance in the cab will be minimal!

[EXTREME]

Preciate it, with the 50s will people hear ya coming or leaving at normal speed??? or just when you red line the bit(h???

[Big Blue HD]

I have a 6.0 HD, which has true duals up to the muffler...so it's impossible for me to have single in :D :D TRUE DUALS ! :D

[timamin]

H-Pipe :)

[rattlznake]

i have true duals up unitll the muffler, a dual in dual out flowmaster 70 series
I bet that is why my truck is soo quiet.

[SSHOTRODSCOM]

Magnaflow has a new x-pipe that just came out that is bigger in the x. It should flow a lot better then the old style. Ill try to get a picture of one in the shop.

[southern k5]

i think true duals sound best

[Roadkill500HO]

Here's a link to how my 5.3L sounds with true duals...

http://myweb.cableone.net/rgeoghegan/exhaust.mpg

[EXTREME]

daaaang, lol, talk about resurrecting threads!!

[Roadkill500HO]

LOL, I just saw where someone had replied to it yesterday. Didn't look at the original post.

[Cowboy Silverado]

True duals

['93Z71]

What do I have? SI/DO. What do I want? True duals baby!

[TouchOfEvil04]

Nevermind just realized how old the thread was.....

[TouchOfEvil04]

Here's a link to how my 5.3L sounds with true duals...

http://myweb.cableone.net/rgeoghegan/exhaust.mpg
I feel sorry for your ears.:sorry:

[Roadkill500HO]

I feel sorry for your ears.:sorry:

Why? I don't hear it. Only the other people around me.

[PHATSPEED7x]

I would have to say true dual exhaust is the way to go. Chevy did do something right on the 96-98 chevy half tons with the 350 vortec. True dual exhaust from the factory until the stock muffler. Made it very easy to install dual exhaust. My 1998 with the 350 has the cats cut out, 2.25" pipe, 18" cherrybomb glasspacks, and 4" stainless steel tips. Sounds awesome.

[89stroker]

i have single in dual out. sounds good to me, and when i added headers i gained alot.

since i added my headers later, the pipes are dual up until about a foot before my muffler, because i didn't have money for a new muffler. but it is still technically SI/DO

[redchevysport]

True duals, no cats, straight thru pipe style glasspacks, and resonators. It's what I got, and what I love... :drool:

[SuperDooley]

What do I have? SI/DO. What do I want? True duals baby!
I agree, i have the single in/dual out just because I bought it that way, it will have true duals very soon hopefully

[race-rodz]

i have a pretty mild TPI 5.7 in a 2wd 78 blazer, i wanted it to be fairly quiet, so for this one i went with shorty gm A-body headers(hpc coated), full stainless 2.25" "y" pipe into 3" back to a borla muffler...then single 3" over the housing and exit on pass side behind the tire.

the whole system is made from stainless mandrel bends and straight pipe.

[Josh350]

I used to have single in/dual out and it sounded good. there was just something about that i liked. It was just cat and then spliced to duals and it sounded good. Now I have magnaflow dual-in/dual-out with no cats and it sounds mean!!! I love it

[Double Dueces]

I heard that true duals aka straight pipes on V8 trucks without a crossoverpipe sound like 2 4banger engines battling it out witch one is most anoyingest.

I want duals but will go with fake duals and no damn muffler. GM trucks with V8s and a flowmaster muffler sound like a damn Camaro. LOL Mustangs are the only thing the should have the right to run with flowmasters. GM needs Magnaflow or borla.

:dunce:

[Terkoss]

Just bought a '92 3500 with the 454. The seller had just had new exhaust installed. I've never seen this before: It's two in (one muffler) two out. And he had it routed to the right side, in front of the rear tire, with Camaro Z28 tips. Pretty cool...sounds great.

So...maybe I'm the only one, but there should be a 3rd poll option: dual-in, dual-out!

[URBAN COWBOY]

Just bought a '92 3500 with the 454. The seller had just had new exhaust installed. I've never seen this before: It's two in (one muffler) two out. And he had it routed to the right side, in front of the rear tire, with Camaro Z28 tips. Pretty cool...sounds great.

So...maybe I'm the only one, but there should be a 3rd poll option: dual-in, dual-out!

That's a true dual exhaust system you have there. It just uses one muffler instead of two. Ford Lightnings come stock with that setup.

URBAN COWBOY

[Terkoss]

That's a true dual exhaust system you have there. It just uses one muffler instead of two. Ford Lightnings come stock with that setup.

Is that right? Okay then...so be it. And it's a small muffler too.

[URBAN COWBOY]

Is that right? Okay then...so be it. And it's a small muffler too.

Yeah, I just had a Magnaflow catback exhaust installed on my "L" and the muffler is a lot smaller than my stock one was. The Magnaflow sounds awesome though. :head:


URBAN COWBOY

[Terkoss]

Yeah, I just had a Magnaflow catback exhaust installed on my "L" and the muffler is a lot smaller than my stock one was. The Magnaflow sounds awesome though.

Speaking of cats, it just occured me that mine has no cat! I'm in Colorado, and I've heard that they're doing away with emmissions testing this year, but don't know when it goes into effect. I wonder if there's any chance it would pass w/o it. Doubt it.

[[SS] Scarface]

It also depends on what year your truck is and what engine you have....

If your truck is a single-catalytic convertor truck (all 80's trucks up through 1995's and some others), then the only legal setup is going to be single in/dual out...

If you have a 1996-1998 Vortec 350 you can do "true duals" and of course if you have a 1999+ "new" model you can do "true duals" because all of these trucks have dual cats.

Without dual cats, "true duals" isn't possible legally.

That being said, I have to recommend doing it. I think the Magnaflow X-pipe is overkill. Just get the shop to weld you a cross-over a few inches before the muffler. This will cost you like almost nothing and will take care of the equalizing effect. Plus I really don't like how that Magnaflow X-pipe narrows down so much....

Also, go with 2.25" piping on a relatively stock 350 smallblock. Otherwise you will lose some low-end torque possibly. With 2.25" Flowmaster 40's, a small crossover ("H-pipe") just before the mufflers and tail pipes coming out the rear, I feel better throttle response and power at all RPM's... enough to make it worth it... along with the way cool sound! True duals sound is awesome.

-Michael
yes that is exactly what i have on my truck plus ive got turndowns i like the in cab noise and deeper sound it gives plus a cleaner look in the back.

[redchevysport]

Speaking of cats, it just occured me that mine has no cat! I'm in Colorado, and I've heard that they're doing away with emmissions testing this year, but don't know when it goes into effect. I wonder if there's any chance it would pass w/o it. Doubt it.

Having no cats is illegal, but quoting from Black Dog "only if you get caught". Do you mean they check to see if you have all the emissions equipment when it gets inspected or an actual test of your emissions from the tailpipe? They don't even do emissions tests where I live. But with fewer than 10K people in the county, I think we are just exempt.

[URBAN COWBOY]

Speaking of cats, it just occured me that mine has no cat! I'm in Colorado, and I've heard that they're doing away with emmissions testing this year, but don't know when it goes into effect. I wonder if there's any chance it would pass w/o it. Doubt it.

Yeah, a big block 454 breathing through no cats would definitely not pass. You're cool though since your state is doing away with inspections.

URBAN COWBOY

[Terkoss]

Yeah, a big block 454 breathing through no cats would definitely not pass. You're cool though since your state is doing away with inspections.

Right, but that's as of December. I'll have to get sneaky 'til then. I've done it before.

[rigamortis]

so has anyone put true dual flowmaster 40s on a 4.8? I want something different on my truck but i want to know if its gonna sound good.

[Zero260]

so has anyone put true dual flowmaster 40s on a 4.8? I want something different on my truck but i want to know if its gonna sound good.

I run true dual w/ flowmaster 40s on my rcswb c1500 w/ 5.7. Its loud, sounds mean, and ppl in a neighborhood always think I am speeding. Works real well on the freeway, but youre gonna lose some torque on the low end.

To answer your question, it will probably sound good, but slow you down off the line.

[StumpJump HD]

With true dual exhaust, the left bank and right bank operate with different back pressures. Because the left bank crosses to the right and then back to the left, you have more bends and a longer flow path. This increases the back pressure on that bank. The X-pipe allows the flows to intermingle, creating equal back pressure on both banks. Imagine if you starved one side of the engine of air. If they work equally they work more efficiently. More power.
It will also sound better because you have eight cylinders flowing equally through two mufflers instead of two four bangers on their own.

[StumpJump HD]

One more thing. Don't do the H-style crossover. We are talking about relatively small pressure differences and the exhaust gas will always take the path of least of resistance. The pressure drop required for the gas to make two ninety degree turns is significant, so it is unlikely that the H-pipe crossover will provide much air exchange between the two sides of the exhaust.

And you have to think area. The reason the X-pipe gets smaller is to maintain velocity. A 5.75 in. diameter pipe has a larger cross section than two 4 in. pipes.

[GMCZ]

X-type design synchronizes the balance of the exhaust pulses from each bank of cylinders based on firing order which increases velocity and scavenging from each cylinder.
-jegs-

[K10 SRV]

Doesn't the X pipe increase scavageing of the engine, where the flow of the exhaust from one side increases the flow of exhaust from the other side?

[phatchevy06]

True Duals all the way...I've never heard a single-in dual-out that sounded even half as good as true duals...

[89stroker]

True Duals all the way...I've never heard a single-in dual-out that sounded even half as good as true duals...

phatty, you should hear my truck then.

[phatchevy06]

phatty, you should hear my truck then.
If you've got any recordings or videos...PM me and send 'em my way. You know I love your truck anyway...(b/c of 383 mostly..ahah) :lol:

[89stroker]

If you've got any recordings or videos...PM me and send 'em my way. You know I love your truck anyway...(b/c of 383 mostly..ahah) :lol:

i don't have any recordings or anything, but i'll try and figure out how to do that so you can hear the beast. IMO it sounds as good or better than a lot of truck around here running duals. most of the people around here are the cholos w/ straights that are just downright obnoxious, so i don't know really.

[phatchevy06]

i don't have any recordings or anything, but i'll try and figure out how to do that so you can hear the beast. IMO it sounds as good or better than a lot of truck around here running duals. most of the people around here are the cholos w/ straights that are just downright obnoxious, so i don't know really.
Aight, when you find out how to do that and get some. Make sure you PM me and let me hear that sucker...

[Pauly]

X-type design synchronizes the balance of the exhaust pulses from each bank of cylinders based on firing order which increases velocity and scavenging from each cylinder.
-jegs-

X pipes and H pipes should be placed as close to the front of the vehicle as possible as this is where most of the tuning of the exhaust takes place.

H-pipes should be 2/3's the size of the main tubing (ideally). If you are using dual 3" pipes, then your H-pipe should be 2". of course any H-pipe is better than no H-pipe. 20-30 lb/ft of torque can be waiting to be unleashed with ZERO effect on horsepower.

If you use long tube headers with 2 1/2" collectors and you also use 2 1/2" pipe off of the headers, wherever you place the H or X pipe determine the collector length. This only works if you use the same size pipe as the collector.

If you use a 3" collector and a 2 1/2" pipe, the collector length terminates wherever the 2 different pipe sizes join.

Collector length and diameter in conjunction with primary header diameter/length can be changed to tune your setup.

Basic rule of thumb, H and X pipes towards the front of the vehicle, mufflers as far away from the engine as possible. The mufflers are usually the most restrictive part of an exhaust system. You want this major restriction as far away from the tuning part of the exhaust(headers and X or H pipe).

The larger the tubing diameter, the louder the exhaust.
One 90° bend is like adding 3" of tubing.

the problem with all of this, is of course this all has to fit under a vehicle. At least in our trucks there usually is more room than sports cars.

I wish that GM didnt have to put the fuel tank inside of the frame rails. 1987 and older GM truck could have some really nice free flowing exhausts installed, the inboard fuel \tanks of today force all of the exhaust to be routed over to the passenger side. I have a side exit exhaust in front of the passenger side rear tire through dual 4" stainless steel tips. iwanted them to exit before BOTH sides of the truck, but the exhaust shops simply refused to install ANY exhaust anywheres close to the fuel tank. I understand, but geeeesh.

Time for a fuel cell.

peace
PAuly

[Timbo1969]

True duals sound better, and Moroso Spiral flows OWN Flowmaster or Magnaflow in the dual muffler category, and a side note Magnaflow destroys Flowmaster in the single dual category both in sound and flow rate.

['96Scrat]

Originally Posted by Terkoss
Just bought a '92 3500 with the 454. The seller had just had new exhaust installed. I've never seen this before: It's two in (one muffler) two out. And he had it routed to the right side, in front of the rear tire, with Camaro Z28 tips. Pretty cool...sounds great.

So...maybe I'm the only one, but there should be a 3rd poll option: dual-in, dual-out!

Yeah, thats what I got to. Flowmaster 40 series. I got a pipe and cat for each manifold, which are then linked seperately to the single muffler and then duel exit the muffler straight out to the back of the truck. Hope you could follow that.:aniteef:

I don't understand how that is a true duel system though? Don't the two pipes enter a single resonating chamber?:think:

['96Scrat]

I looked on the Flowmaster website and could not find a duel in duel exit muffler..?:wtf:

What is on my truck? I thought it was 40 series but now I'm not so sure.:dunno:
I wonder if I might have the 50 series.

(The answer to this question is probably so simple I'll feel like an idiot for asking it later).:aniteef:

[Ross 650]

Howdy,
I had an 01 GMC with the 5.3 engine. I hav a Magnaflow single in dual out set up on it. I should have kept the stock muffler because you couldnt hear the Magnaflow. I now have an 04 with the 5.3 and have a 50 series Delta flow Flow master on it. It sounds so much better than that Magnaflow did. I think Magnaflow is highly over rated for sound. Maybe if I had gotten a short one it would have had some tone to it but it was as long as my 3 chamber Flow. Have a goodun!!!!

[believer]

Gibson stainless Cat back single/double...

88 GMC 1/2 ton
5.7 , March power pulleys, Air-aid cold air intake and spacer ,
Thermomaster Chip, MSD/Excell ignition , 14.50 Mickeys , Rough Country suspension , custom interior , 4 core radiator , 98 front end , $3000.00 paint job to die for!!!!

[Phillip Ramirez]

True Duels would be alright

[claviz13]

True duals!

[KidRick]

Just put the new Pro Series Cat-Back Dual Side exit from MBRP on. True Duals all the way!

[jstnz28]

You wont notice the horse power difference between the two. So save your money and go with the single in dual out.

[bizzybone485]

I love the sound of my TRUE DUAL Exhaust.. im running 2.5 inch through dual delta flowmasters then through a x pipe out 2.5 tips at 45 degrees out the rear corners. I like the sound but i wish i went with 2.25 for a little more back pressure. The exhaust was done really well but i also did pay well for all of it. ($525)This was Christmas 2005

[1tallaznballer]

ok, i read the entire thread, and still need some help...sorry
i have a true dual "02" 8.1 suburban, with an aftermarket setup (no headers), which im changing, cause its rusting...so here is what i am thinking about....i have a great deal on (2) series 44 flowmasters with 3" inlet/outlet, and would like to use them...

my questions are is this to big a diameter? (muffler shop said i would loose torque), and should i use a magnaflow x pipe? it will be exiting out either side, behind rear tires, not straight out back.

here is the link to the flowmasters i have on hold....

http://www.flowmastermufflers.com/products/index.php?main_page=product_info&products_id=4140

thanks for your input....

[phxmark123]

Did someone say that an '88 Chevy Suburban with a 5.7, duals and no catalytics is illegal?

[gambino967]

true dual

[Black90Sport]

whwere do all u guys get true duals? kits, local shops? where??

[cancritter]

put my duals in last summer...took them out yesterday and went back to single 3in.
happy l did...lots more tourque with the single 3in compared to dual 2.5s....food for thought

[tatoodkelt]

True duals.

[TEE]

I'm going against the grain here....I've owned both but, I dig the sound of single 3" in and dual 2 1/2" out.
Winds tighter than duals and is a lil' more quiet until you mash it.
Plus...it don't sound like evry one elses.
Also...I don't like duals out the back because I tow a boat.
Mine's dual out the rear corner.
Edelbrock RPM catback with headers and bigger Y pipe:)

[toryu]

true duals all the way

long tubes and 2 1/2 truals on my 88 with flow 40's and 3 1/2 x 12 tips coming out at 45's behind the tires, plenty of sound and resonance, but i like it that way :devil:

[CptBldSnach]

I just bought a 92 Blazer with true duals and no cats. I hate it! I have a 94 Silverado all stock. i like it better than those true duals. I'm putting the factory y pipe and cat back, and dropping a magnaflow muffler and a dual tip.

[bizzybone485]

true duals all the way

long tubes and 2 1/2 truals on my 88 with flow 40's and 3 1/2 x 12 tips coming out at 45's behind the tires, plenty of sound and resonance, but i like it that way :devil:

how do you like the longtubes. I have midlengths right now but not sure if there is much difference in the two.

[BigBadBowtie572]

I would have to say true dual exhaust is the way to go. Chevy did do something right on the 96-98 chevy half tons with the 350 vortec. True dual exhaust from the factory until the stock muffler. Made it very easy to install dual exhaust. My 1998 with the 350 has the cats cut out, 2.25" pipe, 18" cherrybomb glasspacks, and 4" stainless steel tips. Sounds awesome.
That's what I had on my '98 exactly before my '00 I have now. Granted I had factory cat's on there as well as stock manifolds and smaller tips (3 1/2" by 12" at 90°). I wish I could have that sound back.:bawl: But that may change after this winter. Headers are coming soon! :drool: Can't decide on shorty's or LT's though...
To answer the poll, true duals for a better sounding exhaust. Single in and whatever out if you are ever going to pull something.

[the_husk]

Sup fella's, Would yall go with true duals (all my buddys swear about) or single in dual out? Single in dual out would be alot cheaper and i hear it sounds the same. What would yall go with?

Go true duals, you get better sound and more power across the whole rpm band in my opinion.

[the_husk]

[QUOTE=BigBadBowtie572]That's what I had on my '98 exactly before my '00 I have now. Granted I had factory cat's on there as well as stock manifolds and smaller tips (3 1/2" by 12" at 90°). I wish I could have that sound back.:bawl: But that may change after this winter. Headers are coming soon! :drool: Can't decide on shorty's or LT's though...

I'm sorry, but in my opinion, the newer 5.3's an 6.0s just can't match the sound a 5.7 vortec puts out :10: just my 2 cents.

[Ol'Rover]

true duals are the best, and you have better exhaust flow. But for some of us we cant do that if we dont want to screw around with the TBI or EFI comps. And then you have to branch it to duals past the cats, whuich is good to, but if you want it to be good 'n' loud branch bring your tips out just behinde the cab :D

[LON3STAR]

ok so would this X work with a single in/dual out?

[silverado046.0]

True duals in my opinion.