Do you want it to sound good or just be really obnoxiously loud? Start with headers either way. For the loudest exhaust, just run open headers. Next, the TSP Rumbler will give you a really loud exhaust since they dump straight down to the road surface and that will allow it to bounce back up making even more noise. The SLP Loudmouth or equivalent Bullet muffler would be next for noise level. Borla with the open plate should follow that along with one of the chambered systems like the GMMG. Then for good sounding exhaust which tends to be a little quiter you have the usual Flowmaster, Hooker Aerochamber, B&B Triflo, Magnaflow, Pypes, SLP 2OTL. But those last ones are full cat-backs which will run anywhere from $250-800. And whatever you do, don't put any cat(s) on the car, they tend to muffle the noise too much.
