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"Atlanta, Georgia \u2014 If the thought of produces question marks in your head, you might want to stop reading now, but if an X6 with more power, stiffer suspension, better brakes and bigger tires interests you, you&amp;#039;re in luck because has just released the X6 M.   The X6 M receives a healthy boost of power thanks to a pair of twin-scroll turbochargers. The turbos reportedly produce 29.0 psi of boost and are located in between the valley of the cylinder heads, along with the catalytic converters. The exhaust manifolds feature a crossover design that maximizes the exhaust energy onto the hot-side of the turbos.   Combined with direct injection and variable cam timing, this allows the 4.4-liter engine to produce 547 bhp between 5750 and 6000 rpm, and a torque plateau of 501 lb.-ft. from 1500 all the way to 5650 rpm. Needless to say, the change in power is easily felt from the seat with the power being sent to the wheels via a remapped 6-speed automatic transmission and all-wheel-drive system that&amp;#039;s biased towards the rear wheels.   This system is the same innovative, torque-biasing setup that&amp;#039;s found on the standard X6. The wheels and brakes, however, are uprated. Out front, 275-mm-wide tires ride on 20-in. rims, while massive 315s ride on 20&amp;#039;s for the rear. Slowing it all down are a pair of four-piston calipers out front and a pair of single-piston calipers out back.   Keeping the car planted on the road are electronically adjustable dampers and anti-roll bars as well as a speed sensitive steering rack, which we tested to great effect on the fast and technical Road Atlanta circuit in Georgia.   While it may seem peculiar to test a giant vehicle like the X6 M on the track, it was evident going through the fast Essess that the X6 M was no ordinary car. Equipped with an electronics suite that&amp;#039;s more airplane than car, the torque-biasing system, active anti-roll bars and electronic dampers all kept the big X cornering flat and using every bit of grip the giant tires could provide.   We were even able to hit 140 mph on the back straight, before we realized what kind of car we were in and snapped back to reality. Undoubtedly, the X6 M is an amazing machine. But where it will ultimately sit in the automotive spectrum still remains to be seen. Pricing is expected to start close to $90,000 and will be available in the fall. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.roadandtrack.com/new-cars/first-drives/reviews/a15102/2010-bmw-x6-m-1/>