Most but not all, M3W's have a plate on the inner skin, where the exhaust brackets bolt through. If there is no load spreading aluminium plate on the inside of the car it's a good idea to fit one as the G56 system is heavier than the standard system. Check the rivets along the lower edge of the skin occasionally as the heads are prone to shearing off. This can happen with any exhaust system fitted but is maybe slightly more of a problem with the G56 fitted. The rivets can be easily replaced.
