11-02-2009, 04:45 PM
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#1
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Registered User
Join Date: Oct 2009
Location: wake forest, nc
Posts: 20
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03 5.3 exhaust
what do yall think about true dual straight pipes with high flo magna flow cats
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11-02-2009, 04:46 PM
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#2
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Registered User
Join Date: Jul 2008
Location: MN, USA
Age: 18
Posts: 592
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Re: 03 5.3 exhaust
do it
__________________
1994 Z71 K1500 ECSB 5.7 TBI 218K Miles and still goin strong!
New Truck: 2004 1500 5.3 4WD Manual windows, locks, and 4wd!
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11-02-2009, 08:11 PM
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#3
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Registered User
Join Date: Oct 2009
Location: wake forest, nc
Posts: 20
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Re: 03 5.3 exhaust
would it sound better if i kept my stock 2.25 piping or went up to 2.5 piping
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11-02-2009, 08:19 PM
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#4
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formerly 133
Join Date: Nov 2005
Location: Far away from YOU
Posts: 2,386
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Re: 03 5.3 exhaust
Why not just a single 3" straight pipe?
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11-02-2009, 08:27 PM
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#5
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formerly 133
Join Date: Nov 2005
Location: Far away from YOU
Posts: 2,386
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Re: 03 5.3 exhaust
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11-03-2009, 08:53 AM
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#6
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Pure Country
Join Date: Jul 2009
Location: Hemlock, Mi
Posts: 170
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Re: 03 5.3 exhaust
I have the 2.5 and it sounds great, you dont need to go with the high flow cats though, juss my opinion
__________________
2001 Silverado 1500/ 6" Fabtech/ 3" BL /315 Cooper STTs/ limo tint/ 2 1/2in true duals
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11-03-2009, 10:11 AM
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#7
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RIP Jimmy 523 4 LIFE
Join Date: Mar 2008
Location: Damascus Maryland
Posts: 2,916
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Re: 03 5.3 exhaust
your stock exhaust is 3in inlet and 2.75 out...... from what i hear the cats on these trucks are pretty much hi flows cats to begin with. You might pick up some but probably not enough to justify the cost
__________________
Black 2004 Z71 Silverado ECSB,Superlift FIT 6in Lift,35in pc XATs, 18in XD SPYs,magnaflow cat back, AEM CAI, 93 blackbear tune, 5% tint all around, and alot more
Soon to come-Efans(waiting install),cowl hood,4.56s,
RIP Jimmy Hawkins, Im gonna miss you brother
10/16/1989-10/05/2009
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11-03-2009, 05:53 PM
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#8
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formerly 133
Join Date: Nov 2005
Location: Far away from YOU
Posts: 2,386
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Re: 03 5.3 exhaust
The stock intermiediate pipe is 3"??
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11-04-2009, 07:48 AM
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#9
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Pure Country
Join Date: Jul 2009
Location: Hemlock, Mi
Posts: 170
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Re: 03 5.3 exhaust
i thought the stock intermediate pipe was 2.25 for all the 5.3s, but i could be wrong...
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2001 Silverado 1500/ 6" Fabtech/ 3" BL /315 Cooper STTs/ limo tint/ 2 1/2in true duals
Last edited by CowboyUp; 11-04-2009 at 07:48 AM.
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11-04-2009, 02:28 PM
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#10
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Registered User
Join Date: Oct 2009
Location: wake forest, nc
Posts: 20
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Re: 03 5.3 exhaust
yeah im pretty sure i have 2.25 stock thats why i was wondering if 2.5 would make any difference in the sound
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11-04-2009, 02:32 PM
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#11
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Registered User
Join Date: Oct 2009
Location: wake forest, nc
Posts: 20
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Re: 03 5.3 exhaust
also what is the best out of the y pipe vs. x pipe vs. h pipe
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11-04-2009, 04:54 PM
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#12
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Registered User
Join Date: Nov 2007
Location: Monroe, MI
Posts: 617
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Re: 03 5.3 exhaust
I think a muffler would be beneficial, not only to prevent the obnoxious sound, but to create a little back pressure and help you keep some low end torque, which is an area that a stock 5.3 is already lacking.
__________________
Quote:
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Originally Posted by TheMaroonBaboon
because this thread like an OBS will never die
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2003 GMC Sierra 1500 2wd, 5.3L, 3.73 gears with locker RCSB
Stock 98 C1500 RCLB Vortec 305
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11-04-2009, 08:40 PM
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#13
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Registered User
Join Date: Feb 2008
Location: Overland Park, KS
Posts: 1,591
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Re: 03 5.3 exhaust
Quote:
Originally Posted by CowboyUp
i thought the stock intermediate pipe was 2.25 for all the 5.3s, but i could be wrong...
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Stock intermediate pipe (after the y-pipe) is 2.75" which is why if you buy a 3" inlet muffler it'll slip over the pipe and not be a snug fit to weld up. It's easier to use an adapter or expand the inlet of a 2.5" muffler to fit. I just had mine cut off an replaced with 3" piping.
__________________
95 Sierra C1500
TBI 305, NV3500
10-Bolt 3.42 Open
Custom open air cleaner
Single 3", Thunderbolt cat, 18" d/o Magnaflow, 3.5" tips in front of the rear passenger tire.
New rig (not pictured): 86 Silverado C10 4bbl 350
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11-04-2009, 09:15 PM
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#14
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Registered User
Join Date: Sep 2009
Location: Portsmouth, Ohio
Posts: 3
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Re: 03 5.3 exhaust
Corsa. Hands down the best exhaust I have ever heard on a Chevy/GMC pickup.
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11-05-2009, 09:15 AM
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#15
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Pure Country
Join Date: Jul 2009
Location: Hemlock, Mi
Posts: 170
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Re: 03 5.3 exhaust
Quote:
Originally Posted by 88Vic
Stock intermediate pipe (after the y-pipe) is 2.75" which is why if you buy a 3" inlet muffler it'll slip over the pipe and not be a snug fit to weld up. It's easier to use an adapter or expand the inlet of a 2.5" muffler to fit. I just had mine cut off an replaced with 3" piping.
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ok thanks, ya that makes a lot of sense, idk where my head was on that one.... its been a while since ive even saw a y-pipe, ive had the true duals ran for about a year now
__________________
2001 Silverado 1500/ 6" Fabtech/ 3" BL /315 Cooper STTs/ limo tint/ 2 1/2in true duals
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11-05-2009, 09:19 AM
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#16
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Pure Country
Join Date: Jul 2009
Location: Hemlock, Mi
Posts: 170
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Re: 03 5.3 exhaust
Quote:
Originally Posted by silveradokinggg
also what is the best out of the y pipe vs. x pipe vs. h pipe
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that could be debated without end, basically the cheapest will be the y-pipe, because you will most likely keep the factory y-pipe, the most expensive will be the x-pipe, i have ran both a y-pipe and h-pipe and personally like the h-pipe the best, but a good cost effective way to go is a y-pipe and i have no problem with them
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2001 Silverado 1500/ 6" Fabtech/ 3" BL /315 Cooper STTs/ limo tint/ 2 1/2in true duals
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11-05-2009, 09:28 AM
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#17
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Registered User
Join Date: Apr 2008
Location: Columbus, KS
Age: 21
Posts: 339
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Re: 03 5.3 exhaust
your intermediate pipe is 2.75" inside diam.
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03 GMC. Z71. 16" helo wheels, Bose, 8" MA audio subs, flowmaster super 44 side exit, T bars cranked. 3.73 gears, posi.
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