Picked up my new M3W today, and by the sound of it I am getting the same banging noise on hard acceleration (plus the sort of Bevel Box whine that I thought MMC had eliminated a while ago). I will have to look at the cost of securing the Box to the chassis as suggested above.
Otherwise, it's fantastic.
Congrats on getting your car.
Do persist with the Banging noise. Do not accept that it s in any way how it should be - it is not.
Have your dealer check the bevel drive and drain the oil to see if there is any debris inside. Broken gear mesh inside would cause this noise as the slack is taken up.
It can be caused by hard acceleration the car should in theory be able to sustain this but in practice might not!
A replacement Bevel Box is the way to go.
That's if the belt is at the right tightness.
Hope this helps and do keep us posted.
