I find these online videos don't give a good sense of the sound. It sounds a bit like a lawnmower on start up in this video.
Also I don't really care what it sounds like outside, I want to hear what it sounds like inside the cabin.
2014 ///M5 Individual Frozen Grey, Silverstone Full Merino, Piano Black, Exec Pkg, Drivers assistance plus, LED Pkg, Bang and Olufsen, 20" 343M Forged Alloy Wheels
Countermeasures: Bel StiR+, Laser Interceptor Quad HP, Zaon MRX
Upgrades: Eisenmann Sport with M Performance Carbon tips, Dinan anti-roll bars