Exhaust for 03 Strat RT
#1
#2
You should first fill out your Profile with particulars on the engine, etc. Or.... put these particulars in your posts. What do you mean by useful? Cat back exhausts usually provide a better exhaust tone, duals are eye-candy. The cat-back adds nothing to the performance unless you modify the engine. A big factor in your purchase is how much are you willing to spend.
#3
No catback is being made. They used to have a Borla catback, if you can find one. Otherwise you can get one made for a 3g Eclipse and add about a 12" extension into it somewhere. You're best bet is to Cut out the muffler, and straight pipe it with a nice round tip, sounds best in my opinion.