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Old 08-11-2007, 08:14 PM   #1
MonaroGTO
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Spintech Horsepower gains?

Will adding a Spintech 2.5" Catback w/X -pipe provided any horsepoer gains? Will adding the 3" Catbak provide any power loss to a stock 06 A4?
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Old 08-11-2007, 10:36 PM   #2
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Quote:
Originally Posted by MonaroGTO
Will adding a Spintech 2.5" Catback w/X -pipe provided any horsepoer gains? Will adding the 3" Catbak provide any power loss to a stock 06 A4?
exhausts and CAI dont really give results in terms of HP. at most your looking at 1-3 HP gain, headers is where its at. and you dont want to really go with 3" thats a big pipe that might set of the O2 sensor or worst screw with your emissions.
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Old 08-11-2007, 10:50 PM   #3
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^^^^^I agree, but if you do go with 3" you'll prob. need to get a tune for it.
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SAP GRILL INSERTS AND SPOILER/TSW THRUXTONS STAGGERED 18" W/NITTO NTO5/DEPO TAIL LIGHTS
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Old 08-12-2007, 02:41 AM   #4
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Originally Posted by FROROCKS
^^^^^I agree, but if you do go with 3" you'll prob. need to get a tune for it.

defintly and i dont think you want to waste that kind of money when all you got going is a cat back exhaust, also on newer cars today you want to be running a little bit of back pressure, its not the good old days on the 60s muscle cars have 3 1/2" straight pipes had no affect on the engine. the emissions will be high and the warning lights will be going crazy
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Old 08-12-2007, 02:03 PM   #5
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For a car like the GTO even on the 6.0 dual 3" tubes is overkill, ideally the system should be setup in steps, say, 3" header collectors, into a 3">2.75" X pipe, into 2.5 or 2" dual pipes all the way back.

Also remember that with two pipes you don't need as big a size, unlike a import that runs one pipe, each pipe only feeds 1/2 the engine, so where a 4.0L v6 would need say a 3" single, a 6.0L v8 would probably only need 2-2.25" catback pipes.
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Old 08-12-2007, 05:54 PM   #6
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Originally Posted by Nocturn
For a car like the GTO even on the 6.0 dual 3" tubes is overkill, ideally the system should be setup in steps, say, 3" header collectors, into a 3">2.75" X pipe, into 2.5 or 2" dual pipes all the way back.

Also remember that with two pipes you don't need as big a size, unlike a import that runs one pipe, each pipe only feeds 1/2 the engine, so where a 4.0L v6 would need say a 3" single, a 6.0L v8 would probably only need 2-2.25" catback pipes.

exactly, bigger isnt always better especially when the car alrady has a dual system set up for you, at least you will getter a better flow because the plumbing is new, as you can see on another post here the factory pipes are dented and dinged up that make you cringe
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Old 08-12-2007, 06:55 PM   #7
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I suppose if you get forced induction (maggie,big turbo) and are putting out some big numbers in horse power, I would go to a 3". Hmmm.....someday!
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2005 GTO-PONTIAC EVOLVED
IMPULSE BLUE METALLIC/BLUE INTER./A4/K&N CAI/TVS1900/GATES HD BELT
3" FLOWMASTER CAT-BACK W/SUPER 40'S/E2 CATCH CAN/160* STAT/OPTIMA RED TOP
SAP GRILL INSERTS AND SPOILER/TSW THRUXTONS STAGGERED 18" W/NITTO NTO5/DEPO TAIL LIGHTS
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Old 08-12-2007, 08:15 PM   #8
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Quote:
Originally Posted by FROROCKS
I suppose if you get forced induction (maggie,big turbo) and are putting out some big numbers in horse power, I would go to a 3". Hmmm.....someday!
True, but thats a whole different beast.
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Old 08-12-2007, 08:30 PM   #9
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Spintech Claim.....

Spintech claims a 11 hp gain on its website for the GTO ......what you guys think?
I had actually heard that there were no gains but i just wanted to confirm before i waste go my money.
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Old 08-12-2007, 08:36 PM   #10
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Originally Posted by andyx181x
exhausts and CAI dont really give results in terms of HP. at most your looking at 1-3 HP gain, headers is where its at. and you dont want to really go with 3" thats a big pipe that might set of the O2 sensor or worst screw with your emissions.
so headers with stock catback works ok?
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Old 08-12-2007, 08:41 PM   #11
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Quote:
Originally Posted by MonaroGTO
so headers with stock catback works ok?

well for sure the headers will give you way more HP then any aftermarket exhaust, you dont even really need the exhaust. but dont be expect like a 15 HP gain, they are just pulling your leg on that. will your engine feel smoother and sound leaner? yes it will, especially when all the plumbing has been remade for the exhaust. with headers im thinking 5-8 HP gain? anyone else agree? but you should back that up with a CAI to complete it, but again do not get your hopes up thinking you'll have 425 HP just on those things alone
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Old 08-12-2007, 08:43 PM   #12
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Quote:
Originally Posted by Nocturn
True, but thats a whole different beast.

exactly, thats a differnet plumbing system to go about with too especially on a Turbo. but you also gotta put a different oil pump, the intercooler, upgrade the fuel injectors, etc.
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Old 08-12-2007, 08:45 PM   #13
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Quote:
Originally Posted by andyx181x
exactly, thats a differnet plumbing system to go about with too especially on a Turbo. but you also gotta put a different oil pump, the intercooler, upgrade the fuel injectors, etc.
did you see the flyer i posed above^^^^^^

Thunder racing told me 30 hp gain from kooks..
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Old 08-12-2007, 09:56 PM   #14
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Quote:
Originally Posted by MonaroGTO
did you see the flyer i posed above^^^^^^

Thunder racing told me 30 hp gain from kooks..
30 wow thats a bold statement, i dont think 30 for sure even after a tune, maybe 10-15 the most
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Old 08-13-2007, 08:07 PM   #15
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keep in mind that 30HP is around only 15RWHP...so...
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