I think it sounds AWESOME. Like a 911 Turbo with an exhaust. Of course the S65 sounds better, but I won't mind that exhaust note at all, especially if the car is lighter/looks better.
Current: Alpine White F10 M5|H&R springs|12mm/10mm spacers|Eisenmann Race
Sold:Imola Yellow RS4-KW V3|MTM 10mm spacers|Hotchkis rear sway bar|APR Stage 1|Milltek Catless|RNS-E|Euro RS4 Flat bottom Steering Wheel