@n20
the prices again differ for mufflers, from design, to the brand name, if u want to go for a good exhaust, (by that i mean just the back box), keep in mind around 5k, altough there are cheaper alternatives available, but in 5k u can get a good one, but if money is not an option i'd recommend you to go for none other than a "Brola" exhaust, expensive but for me the best, its not gonna be an easy find here, either u can import 1, or buy 1 from e-bay, u just might find a great deal there :).