Exhaust System Upgrade

[BLK GTO]

I have and original exhaust system on my 92 twin turbo. What is an ideal pipping 2.5" or 3" twin exhaust ? Or is it better to go single from cat back ???

[talskinyguy]

3" is stock, and good enough for most applications. You just need a high flow at the end, and why not get new piping while your at it. Im doing a single outlet, less weight and same flow. But do what works for you, single outlet looks funny with the bumper we have.

[stevo548]

keep your double single won't be any faster if you do your exhaust right, just make sure you keep the 3" piping.

[talskinyguy]

single exit will weight less, so it will technically be faster.