BMW's largest coupes and convertibles seat four and come in two versions. The 650i models have a 360-hp V8. The M6s have a 500-hp V10, and for 2007 are available in convertible as well as coupe form. The 650s offer a choice of three 6-speed transmissions: automatic, conventional manual, and BMW's SMG sequential manual transmission (SMT). M6s offer a 7-speed SMT. Both SMTs can be set to shift like an automatic. Convertibles have a power soft top and a heated glass rear window that can act as a top-down wind deflector or be lowered for top-up ventilation. All models have ABS, traction/antiskid control, and BMW's Active Roll Stabilization designed to counter body lean. Also standard is BMW's Dynamic Drive Control that adjusts suspension, throttle, and SMT/automatic-transmission settings for sportier response. BMW's Active Steering, designed to quicken low-speed steering response, is standard on M6s, available on 650s. M6s also include a driver-adjustable suspension, uprated brakes, and larger wheels. Front side airbags and front knee airbags are standard; coupes add head-protecting tubular side airbags. All come with navigation system, steering-linked headlights, and BMW's i-Drive controller for climate, audio, and navigation functions.