[Italian Lunaticz]

Ok im thinking about getting a downpipe for my NA 93. I know theres a lot of threads on this topic but i wanna be sure before i have my rents throw money out there or myself if i decide to get it after x-mas. I've looked at 3sx and everything and the FAQ's. I just want to know anyone that has one whats the best type to get performance sound and price wise. Just wanted some input so i can pick one out soon and see if i can get it. Also the one on 3sx i thought was only 2.5 and i thought the best was at 3". They have ones on Ebay for half the price should i look into that? Any input helps. (P.S. Correct me if im wrong but the if i get an aftermarket downpipe it doenst replace the back cat it bolts on to that but can be replaced with the race pipe?) No cutting necessary right? Anyone have the race pipe and is it worth it?