A revised six-speed ZF Type H manual transmission with a heavy-duty clutch delivers power to the 2006 BMW M Coupe’s rear wheels. Upgrades include better gear synchronization, lighter shift feel, firmer gear engagement, shorter throws, and lifetime transmission oil that never needs checking or changing. At night, the shift pattern on the gearshift knob is illuminated – a slick touch found on all M models. Other powertrain goodies include a heavy-duty differential equipped with NACA air intakes to keep it cool, an M Variable Differential Lock that keeps the M Coupe buttoned-down on low- and split-traction surfaces, and an M Logic stability control system with start-off assistant to keep the car from rolling backward on hills while the driver switches from the brake pedal to the accelerator.