Putting power down through the rear wheels or the xDrive system requires a driveline built for serious torque, whether you utilize the lightning-fast ZF8 automatic or the engaging 6-speed manual transmission. Manual F32 owners looking to tune their N55 will need to upgrade their friction hardware; our Uprated Clutches & Flywheels (including the popular 550i upgrade) are designed to hold massive torque increases without slipping. To maximize corner-exit grip on RWD models, installing mechanical Differentials (Limited-Slip) will completely revolutionize your coupe's handling dynamics. Eliminate chassis flex and subframe movement during hard acceleration with stiffened polyurethane Drivetrain Bushes, backed by our extensive range of Misc Drivetrain Parts.