Transferring 322bhp to the tarmac through either the smooth ZF8 8HP50 automatic transmission or the engaging Getrag GS6-45BZ 6-speed manual requires a highly robust driveline. For manual owners looking to increase their power output, upgrading is essential; you will benefit hugely from Uprated Clutches & Flywheels (including the popular 550i upgrade) designed to handle massive torque increases without slipping. To maximize traction on standard rear-wheel-drive models, installing mechanical Differentials (Limited-Slip) will completely transform your corner-exit grip. Eliminate unwanted chassis flex and rear subframe movement during hard launches with polyurethane Drivetrain Bushes, backed by our extensive range of Misc Drivetrain Parts.