do all aftermarket gst catbacks come w/ 3" piping?i found a tanabe racing medallion for 525 shipped but they couldn't tell me if it had 3" piping(i think they shouldn't be allowed to sell these things if they don't know there products,but hell they were cheap)My apexi N1 doesn't seem to have the 2.5" piping i thought it did.looked more like 2.25".
last question.would it be dumb to have 3" piping but have a 2.5 high flow cat and the 2.5/2.25? d/p from star?

don't know if they come in 3" but I do know that you can get one made from www.ahpproducts.com and he will custom make a mandrel bent catback for you and you can put any muffler you want on it.