The BMW X5 M is a Sport Activity Vehicle which extends the BMW M line up, previously consisting of variants of the M3, M5 and M6. It was introduced to the press at the New York Auto Show (Apr 09-19, 2009), and started appearing in BMW dealerships in September 2009. This latest high-performance M offering rivals the Mercedes-Benz ML63 AMG, and the Porsche Cayenne Turbo S. At the time of its launch it is the Worlds most powerful car in its class. BMW has put the high-performance Sport Activity Vehicle through extreme durability testing typical of M and BMW products. Slightly more conventional than its BMW X6 M sibling, the M offers the same utility as the regular X5, with the addition of the V8 M TwinPower Turbo, a twin-turbocharged 4.4-liter V8 delivering 555 Horsepower at 5,750 RPM and peak Torque is 501 lbft, available between 1,500 and 5,650 rpm. The Sport Activity Vehicle can sprint from a standstill to 62 mph (0100 km/h) in 4.7 seconds, according to tests in the U.S. Market.