I have both AMG & M3. M3 has Race eisenmann & the AMG has had sports muffler change with quad tips.
The M3 now sound as good as my AMG ( but has slightly difference sound), the only other thing that is different is that the M3 revs to over 8,000 so up the high end now it sounds a little like a Ferrari. Which I like but the race exhaust is what it says it is RACE and that was the sound I was looking for.
At 95db its not loud in the cab, 4 people can still talk with the radio on but if you put your foot down the talking stops anyway.
You make a change to your exhaust for a reason, the standard exhaust to sports in my opinion is not worth it, 75db is standard & 95db is Race and the Sports system is 75db also.
X5 F15 M50d White, 20"rims, Yellow Calipers, Ceramic Pads. Better off saying what it does not have and that's a B&O Audio System, otherwise all option boxes are ticked.