Need to get new exhaust put on so I can pass inspection.Gonna get a new cat was looking at thunderbolt with a flowmaster super 44.Now do I get 2.25 for the cat? Or 2.50 I know everyones always goes up to the 2.50 and the downpipe stock is 2.25 correct? So the 2.50 wouldn't fit.correct me if I am wrong. Theres tons of different thunderbolt cats which one do I get and do the o2 sensors go on it or do u have to get that custom.just going by the pics on performance curve.