m156 or m157

Ok, AMG anoraks on. A few of us have commented that whilst the M156 exhaust note is louder/fuller than the biturbo, at cold start our M157's seems even louder than the M156 at cold start. Here's why, from: William Vetter Asst. Product Manager - AMG & Black Series Exclusive Vehicles...

This is a quote from MBOF, by a longstanding member with a significant number of posts (in other words, not an agitator). The actual source and therefore the reliability (no pun intended) of the content remains unverified. I post it for information/interest only: My mate popped in today for a...