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05-15-2008, 02:38 PM
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#1 |
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FSC Member
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question on catback
I have a 2007 duramax lbz that I took my cat and muffler off, Now I came across a good deal on a 5'' catback. My question is a guy wants my hole set up and he would give me his but his still has the cat, if I use the cat is there any difference on power with or with out the cat?
Sorry for the stupid question. Thanks guys. 
Last edited by ckresto : 05-15-2008 at 02:39 PM. |
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05-15-2008, 03:40 PM
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#2 |
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1 Twisted User
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Re: question on catback
I believe on your truck it would increase power if removed. Wait for a couple others to chime in as well.
 96' K2500HD 6.5l TD, Heath PMD, Turbo Master, Mand. Bent X-Over Pipe, 4" Flo Pro Exhaust, Vac Pump Removed Belt # 4061000 = 100", 04' Dmax wheels w/ 265's 99' Silverado 5.3l Z71, 265's with Cooper STT's |
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05-15-2008, 04:40 PM
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#3 |
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Diesel Member
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Re: question on catback
I don't think it will be noticeable power by the seat of the pants.
Duramax badger truck pullers association.
Real trucks don't have spark plugs! 2007 3500HD NBS Duramax 2005 2500HD Duramax sled puller 1996 1500 6.5L converted SVO/WVO 16city/22hwy 2000 malibu 3.1 vin J 2006 arctic cat prowler 650 H1 5th wheel 34' PJ flatdeck trailer |
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05-15-2008, 07:22 PM
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#4 |
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Chest Poundin' Apes!
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Re: question on catback
Not enough to notice, losing cats actually cost you a few hp down low, but that's about it. Diesel Power did a dyno article last year, and the cat being removed didn't increase power, but the few it lost was really small, and most likely you wouldn't notice it.
2004.5 Chevy CCSB D/A LLY
Tuff Country Suspension, Toyo MT's, Exhaust, EFI Live, Danville 64mm VVT, Kennedy Pumps, SunCoast IV, some Mike L. tranny stuff, some color matching, lots of other junk. 
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05-15-2008, 07:48 PM
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#5 |
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The Big D sucks arse
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Re: question on catback
on the d-max, do the cats have sensor's to it?
I know on my 04.5 CTD, it had a cat but nothing connected to it. I'd imagine if there were sensors, then it might affect it 
Proud father of 2 sons now
 Jonathan Blake: 8/31/01 Robert Elliot: 6/29/07 Yeah..... I drive a Nissan Altima, but w/ 29 mpg.... I can live with that |
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05-15-2008, 08:38 PM
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#6 |
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Chest Poundin' Apes!
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Re: question on catback
No sensors, but it most likely will cause either a stored code (on mine I get 2 EGR codes, but no CEL) and the newer ones I believe the EGR codes will cuase a light, however, he already lost the cat, so I am sure he's dealing with his possible CEL with either tuning or unplugging the EGR. Some of the newer handhelds can disable the egr and also there are the blocker plate and "fingerstick" that can be used to fool the computer as well.
2004.5 Chevy CCSB D/A LLY
Tuff Country Suspension, Toyo MT's, Exhaust, EFI Live, Danville 64mm VVT, Kennedy Pumps, SunCoast IV, some Mike L. tranny stuff, some color matching, lots of other junk.
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05-16-2008, 06:47 AM
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#7 |
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FSC Member
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Re: question on catback
Its been off since day one and it's never showed me a code. So if I go to 5' would that give me any better chance of troughing a code. or is there a sound difference?
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05-16-2008, 06:57 AM
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#8 |
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The Big D sucks arse
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Re: question on catback
5" is pretty big if your motor is stock
 If you plan to do some mods, then 5" right now might work okay
Proud father of 2 sons now
Jonathan Blake: 8/31/01 Robert Elliot: 6/29/07 Yeah..... I drive a Nissan Altima, but w/ 29 mpg.... I can live with that |
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05-16-2008, 07:19 AM
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#9 | |
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FSC Member
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Re: question on catback
Quote:
Ya I know it may be over kill but it's a brand new bully dog cat back for 300.00 still in the box. So I can't pass it up.
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05-16-2008, 07:51 AM
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#10 |
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IM MIKE D
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Re: question on catback
why bother with just a cat back? youre still going to have 3.5" exhaust up to the cat so i would think the only thing it would get you would be louder sound. plus by putting a cat in your truck it might raise the EGT's some, not enough to hurt anything but the lower your EGT's are, the better.
 03 GMC 2500 HD crew duramax, 6" full traction lift. 37/13.5/20 Toyo Open Country MT's, ATS E-Power tuner, AEM intake, Stage 3 allison 452 RWHP/755 TQ verified on superflo dyno, 7/19/08 (ATS level 10) and thanks to Chuggs for the sig! 
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05-16-2008, 09:29 PM
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#11 |
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Chest Poundin' Apes!
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Re: question on catback
Yeah, Foreman is right, your flowing better right now that you will with a 5" catback. You'll only have 3" off of the turbo, then it goes 3.5" into the front pipe, then into the cat and it snakes around (ever look inside one of those?). The cat is also going to muffle your sound so the 5" sound will be negated as well. 5" isn't needed until you are way over 600hp.
2004.5 Chevy CCSB D/A LLY
Tuff Country Suspension, Toyo MT's, Exhaust, EFI Live, Danville 64mm VVT, Kennedy Pumps, SunCoast IV, some Mike L. tranny stuff, some color matching, lots of other junk.
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05-17-2008, 03:02 AM
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#12 |
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Registered User
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Re: question on catback
I have an LB7 and when I when catless you can feel it in the mid range big time for the better, but I have a diffrent engine with the old school turbo.
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05-19-2008, 08:54 AM
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#13 |
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FSC Member
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Re: question on catback
cool well you all save me 300.00 I will just leave it alone. It sounds good now. My luck I would get it and not like the way it sounded anyway. thanks!
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