You can do the 3" exhaust. Any system will do, its just a preference of sound. I think most use the Corsa by far. While you are doing that mod you may want to do the high flow cats (or cat delete, but then you will need Cat Sims for the rear O2's) and headers. For headers you need to decide at what point you plan on modding your car.. (do you want to do a supercharger or heads/cam car at some point) that will determine whether you need the 1 7/8" primaries or not. Then do the T&D rockers. After you do that, if you are happy and want to stop modding,FIND (they dont make them anymore) a mopar performance ECU. If you want to keep going open up the wallet and shake.