which is better? who makes more power? which one will work better with my current exhaust? ( spintech 2.5" cat back with spintech pro streets) i can't decide what to buy.:confused:

which is better? who makes more power? which one will work better with my current exhaust? ( spintech 2.5" cat back with spintech pro streets) i can't decide what to buy.:confused:

I can't comment on which headers work better with the Spintech catback, but I can tell you that I do like my Kooks long tube headers with catted midpipes. They bolted right up to my Magnaflow without any problem.

-K

Kooks all the way,

The 1pc mid pipes are much nicer than the 3pc Stainless Works

Fitment and build was top notch.

I also have Kooks, but I'm still running the stock exhaust (sans mufflers). Had them professionally installed, so can't speak on how difficult they are to pu in.

is it a problem going 3" to 2.5"?

is it a problem going 3" to 2.5"?

The idea is to unrestrict the exhaust. If you introduce a 2.5" restriction, you limit the amount of exchaust that can move through the system. With this said, I am unable to think of a catback system for the new GTO that is larger than 2.5". You may want to look around and see what you can find. If you do find a 3" catback, please let me know because I am curious. :)

-K

stainless works has a 3" inch system, but until mine falls off or i hit the lotto it will have to be 2.5.

stainless works has a 3" inch system, but until mine falls off or i hit the lotto it will have to be 2.5.

Thanks for the information. There seems to be something I recall about losing low end torque if the exhaust back-pressure is sufficiently reduced. I guess the question is: How much does one have to reduce exhaust back-pressure before this becomes a problem?

-K

Thanks for the information. There seems to be something I recall about losing low end torque if the exhaust back-pressure is sufficiently reduced. I guess the question is: How much does one have to reduce exhaust back-pressure before this becomes a problem?

-K

Heres how it works, As your exhaust travels through the pipes, it cools, thus becomes less preassurized. So in order to keep the same amount of flow through your exhaust you should always used a stepped exhaust system. While dual 3" pipes all the way back may sound better, using 3" collectors, to a 3" in 2.5 or 2.75" out Xpipe, into 2.5 Tail pipes would perform better across the range.

Why is higher flow better? Because your exhaust cools, it becomes less preassurized and slows down, this causes extra backpreassure on the exhaust as the hotter exhaust then has to push the cooler exhaust out of the way...

Make sence? I've read alot of test done exhaust and the size of the pipe from the muffler back makes almost no difference in performance.

yeah, what he said. i have 3" collectors and mids going to a 2 1/2" x-pipe and spintech exhaust. i like my SLP LTs because they come already coated. that saves quite a bit of money but they all make about the same power. i did have 3 bolt flanges welded on my collectors and mids to make a leakproof joint. i had too many trouble with the slip fittings and seeing as i use a wideband O2 it was essential that i not have any leaks.

Kooks>SW>SLP (IMO)

Kooks will pobably fit the best out of the three. As far as one making power there will be little to no difference between them.

ive got the slp lt love em. the only other headers i would go with is the dyna tech. but i got a good deal on the slps thats why went with them.