Hi, i have the standard 2.5 STI exhaust on my STI, and had both cats removed. I was wondering if i would actually gain any performance if i upgraded to a "performance" 2.5 inch exhaust to replace my standard STi exhaust. If they are both the same size and the cats have already been removed then would i gain any more power? I plan to upgrade my engine to 380 bhp in the summer, some people have said leave the STI exhaust on some people have said to change it, any ideas?

 

Didnt we answer this for you the other day?

 

https://www.scoobynet.com/scoobynet-...w-exhaust.html

 

I know people said that my 2.5 inch will be ok for my needs but I was just wondering if I did swap it for a 2.5 inch performance one (stainless steel , lifetime warranty) then would it give me more preformance, cheers

 

The performance exhaust wont rust and will sound and look nicer.

 

As explained before on the thread, a 2.5" is fine for 400bhp, and helps early spool up.

A stainless one wont rust, and it will be lighter.