Forza Motorsport 5: The Corkscrew

My return of the NSX Type-R from Forza 4 with a revamped set for the livery. Unfortunately Turn 10 appears to have bugged the car's engine sounds as with the turbo installed you get a constant sound of the turbo spooling up no matter what including when idle, and with a supercharger installed you have a normal sounding NSX but the supercharger whine randomly appears in the middle of races and replays.