Got the exhaust installed yesterday at the dealer. The exhaust is not as loud as expected though I love the sound. It has a unique suction sound that is quite enjoyable. Do not have details on how it really sounds outside since I just got it on. The best way to explain it is that it is about 25-30% louder than stock and the shifting burble sound I between gears is much louder.
Also I do not know if this is discussed but if you have it in park and rev it in comfort mode and let go of the gas compared to sport and sport+ there is a much more aggressive burble and pop sound in the sport and sport + mode which is really enhanced with the m exhaust .