Hard to find (used) original Supersprint muffler from E39 540i, but should fit all others; 525i 528i and 530i. Still on the car and you can hear it before you buy (not many places you can get that!), very nice sound, NOT loud at all. New cost is about $1000, first $450 gets it (no rush sale, so no lowballers please). This is a rare find for a brand name exhaust!