F10 M5 Exhaust Valve Mod! Can We Make The STOCK Sound MEANER??
Exhaust valve mod on the F10 M5 to hold flaps open under low to moderate loads as well as full throttle, when they would normally be pushed open.
Exhaust valve mod on the F10 M5 to hold flaps open under low to moderate loads as well as full throttle, when they would normally be pushed open.
