Alright, here's the deal. I have an 89 N/A and am looking at getting a test pipe for my car. Almost all of the ones that I have found have been 3" test pipes. My question is will a 3" test pipe fit on an N/A exhaust. My exhaust consists of a stock header, y-pipe, and cat, with a Pacesetter 2.5" cat-back. I have seen one 2.5" test pipe on e-bay, but I am a little hesitant about that.