SLP Powerflo Catback system is an excellent choice if you are looking for a complete catback system that is ready to bolt and it won't shock your wallet to much either. I had Magnaflow mufflers on my old GT and they were nice, but the cabin droan was pretty extensive. The 40 seriest Flowmasters are good too, and they run along the same lines as the Magnaflows in regards to cabin droan.

If you make a lot of long trips, you will want to keep that in consideration. It can make those trips painfully annoying. But zooming around town and stuff, they sound great, but if you want the real benefit of a true catback system, I would recommend the SLP or even the GMPP catback systems.