Originally posted by Riva
hmm....I think I'll consider Carsound cats, then. Umm...do you know what size I should get, 2.5" or 3"? I have an Apexi WS exhaust and I can't recall how many inches the piping is.
Thanks for all the replies!
get 2.25 inch, that's what i got and i have a apexi ws too. the apexi ws is 60mm or 2.34 inches and your header collector is small enough to attach to the stock cat. so getting a 2.5 inch is a waste since you have smaller pipe before and after the cat.
i can't imagine what a ws + stock cat sounds like, cause this is still damn quiet with the high flow unit.