k i need to replace my cat and catback on my 86 2.8 camaro, so i was going to get the dynomax 2.5" catback for my car, but now i need a cat.

where should i get one? and wat size? i need a 2.5" cat right? because i need it to hook onto the ypipe easily too... and isnt the y pipe 2.25" on V6's? so im confused at which size to get or if the dynomax catback will fit a 2.25" or 2.5" cat. im looking for free flowing, i saw dynomax cats in the jegs catalog but i dont know which one to get. they are either 2 way or 3 way or 3 way with an AIR tube, which do i get and do i get 2.5" or 2.25"? they are all 14" long... is that too short? any part#'s or help appreciated, thanks a lot