Ford FR500S mufflers are the best muffler for the Bullitt but rare as hen's teeth now since they're out of production. I've had them on both my '08 Bullitts and my '09 GT500. Solid, bassy sound, no drone, quiet when you're off throttle, thunderous when you punch it, just as an exhaust should be. You might inquire if anyone has a set in the garage they're no longer using. I've picked up a couple sets that way. You won't find any in stock on any of the moto-store web sites.
Good luck!
Good luck!
