Found out my 90t has a 3" downpipe, stock cat and stock muffler. And I'm thinking, did they run out of money here or something? So I decided I'm going to keep the cat, albeit make it a 3" hi-flow one. What to do about the muffler - I really don't like the "ricer" sound, I don't like a loud car period. I don't know if I want one of those tin can ones either that are so popular on SM (sorry guys!). Anyone got pics, got suggestions? What hi-flow cat gives a decent balance of performance vs. fumes?