BMW F80 M3 Catless + Active Autowerke Equal Length MidPipe Resonated + M-Performance Muffler Revving
Here is a short clip of the sound that my BMW M3 F80 makes, with revving when standing still, with the following setup:
Catless Downpipes + Active Autowerke Equal Length MidPipe Resonated + M-Performance Muffler