Powerflex Rear Differential Rear Mounting Bushing BMW G8X M2 M3 M4 Camshafts 5150 AutoSport MMX BMW G8x Dual Differential Mount BMW G87 M2 G80 G81 M3 G82 Powerflex Dual Mount Rear Differential Bracket PFR5 4030 for BMW F80 M3. As engine builders and drivers push the upper limits of the BMW G80 G82 G83 G87 platform, the factory differential mount has proven itself to be a weak point, failing under torque. The 5150 Differential Bracket utilizes dual subframe mounting points and quad direct differential mounts to eliminate differential movement under load. No modifications are necessary for installation, as our kit utilizes factory mounting points. Constructed from billet aluminum and treated for exposure to the elements, the 5150 AutoSport Billet Differential Bracket for G8X will be a game changer for high horsepower, high torque drivers who put their components to the ultimate test with hard launches and heavy cornering.