Fair enough. I’ve had multiple tunes on my M3, and tuned my prior cars as well. I understand that burbles is just one parameter of a tune. I can select the burble level I want on my current M3 tune, on a scale from 1 to 12, oddly enough. All I am saying is, if you have a tune set up to shoot flames out of the tailpipe it’s not for performance, or longevity. It’s for ***** and giggles. Which is fine, but you are doing a number on your cats (if you have them) and are doing it at the expense of performance, not to enhance it.