worst vid in the world about engine sounds. they need to STFU, start the car, rev it a couple times, give 1/4 run run and a blast-by run, then another rev. STFU is the key part...and kill the background music. Gett rid of the fucking zebra masking already too. It looks about as typical of a MBZ there is.
otherwise, it sounds like a V8.
Side note: Saw a blond driving an AMG Coupe in New Albany yesterday and her plate was MB VROOM. I approve of women like that.