The second generation of the BMW 6 Series consists of the BMW E63 (coupe version) and BMW E64 (convertible version) grand tourers. The E63/E64 generation was produced by BMW from 2003 to 2010 and is often collectively referred to as the E63. The E63 uses a shortened version of the E60 5 Series chassis and subsequently shares many features. The car initially drew criticism, due to its controversial styling and complicated iDrive system. The M6 model was introduced in 2005 in coupé and convertible body styles. It is powered by the S85 V10 engine shared with the E60 M5, and most M6s were produced with a 7-speed automated manual transmission ("SMG III"). In March 2011, the BMW 6 Series (F06/F12/F13) began production as the successor to the E63. Development and launch The exterior was designed by Adrian van Hooydonk, based on the 1999 BMW Z9 concept car designed by the then BMW Design Chief Chris Bangle. The controversial rear styling, first seen on the E65 7 Series, was nicknamed "Bangle Butt" by critics. BMW described the styling philosophy as "flame surfacing", where concave and convex shapes meet to create sharp edges. To reduce weight, the doors and bonnet are made of aluminium, and the boot and front wings are made of carbon-reinforced plastic. The kerb weight is . Body styles Coupé (E63) Coupé models were unveiled at the 2003 Frankfurt Auto Show, and introduced on the market in mid of the 2003 model year. Convertible (E64) Convertible models were unveiled at the 2004 Detroit Auto Show, and released in mid 2004. Convertible models featured a non-conventional convertible top design with side fins and an integrated wind deflector that can be raised or lowered at any time. Engines Top speed for all models is electronically limited to . Petrol Diesel Drivetrain The available transmissions are: 6-speed ZF S6-37 manual (630Ci / 630i) 6-speed ZF S6-53 manual (645Ci / 650i / M6) 6-speed ZF 6HP19 automatic (630Ci / 630i) 6-speed ZF 6HP26 automatic (635d / 645Ci / 650i) 6-speed ZF 6HP28 automatic (635d LCI / 650i LCI) 6-speed SMG (630i / 645Ci / 650i) 7-speed SMG III (M6) Unlike the related E60 5 Series, the E63/E64 was not available with all-wheel drive (xDrive). Equipment Features available included adaptive headlights, parking sensors (Park Distance Control), voice control, variable rate steering (Active Steering), active anti-roll bars (Active Roll Stabilisation), radar cruise control (Active Cruise