^same, it xost me 250 installed for my FLowmaster.
Flowmaster Original 40 series: Loudest/most rumble
Magnaflow: Louder then stock, but not as loud as the flowmaster
Gibson: as close to stock (sound wise) as it comes with aftermarket systems. Still gives a low sound, but it is quiet compaired to the others
Borla: almost like the best off all worlds, its not quite as loud as the Flow but it comes in a good second, plus gives you the performance of the magnaflow and gibsons. BUT it will cost you a good $400plus