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?

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.

^^^^^I agree, but if you do go with 3" you'll prob. need to get a tune for it.

^^^^^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

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.

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

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!:)

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.

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.

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?

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

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.

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..

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

keep in mind that 30HP is around only 15RWHP...so...

keep in mind that 30HP is around only 15RWHP...so...


oh yea big time, i think thats by far the most important thing that has to be taught about when it comes to the power of an engine, is the real life HP the car gives not just the engine, probably calm down a few egos

thanks guys for the information, much appreciated

did you see the flyer i posed above^^^^^^

Thunder racing told me 30 hp gain from kooks..

Hate to break it to you guys, but my goat went from 334 to 372rwhp with Kooks 1 7/8" w/cats and tuning. I also had a CAI before and after the Kooks.

Hate to break it to you guys, but my goat went from 334 to 372rwhp with Kooks 1 7/8" w/cats and tuning. I also had a CAI before and after the Kooks.

hmm evidence is always good, please be more detailed for our friend here

did you see the flyer i posed above^^^^^^

Thunder racing told me 30 hp gain from kooks..

Combined with a tune for sure...with CAI, catback, long tube headers, and no tune, I made 358 rwhp...which I figure corresponds to a gain of approximately 18 rwhp, give or take a few horsepower, over the stock configuration. After a tune, I was making 374 rwhp.

-K

Combined with a tune for sure...with CAI, catback, long tube headers, and no tune, I made 358 rwhp...which I figure corresponds to a gain of approximately 18 rwhp, give or take a few horsepower, over the stock configuration. After a tune, I was making 374 rwhp.

-K

ahh so there may be hope, you guys are lucky to run long tubes, cops here in L.A. already got the hearing down for long tube headers

Sad isn't Andy.... I would love to run long tube headers.
That's a ticket waiting to happen.

so i guess the numbers are in the dyno. Kory, i definetly believe ya!

Sad isn't Andy.... I would love to run long tube headers.
That's a ticket waiting to happen.


got that right, if we manage to pass smog with long tubes, you know the cops in LA already got the ears ready for exhaust, nothing like a 250 dollar fine for dsiturbing the peace with loud decibles, blah

Combined with a tune for sure...with CAI, catback, long tube headers, and no tune, I made 358 rwhp...which I figure corresponds to a gain of approximately 18 rwhp, give or take a few horsepower, over the stock configuration. After a tune, I was making 374
rwhp.

-K

did u dyno tune it or did u get like a predator tune .. tryin to determine which is worth the doe

did u dyno tune it or did u get like a predator tune .. tryin to determine which is worth the doe

This tune was a full blown dyno tune.

-K