After 6 years of development, the new model was officially unveiled at the end of June 2006 and was presented at the 2006 Paris Salon. Like its predecessors, the C216 has no B-pillar interrupting the sleek curve of the side windows. The W216 is offered in four models, each with its own engine and transmission, the 5.5L V8-powered CL 500 (available with 4MATIC all-wheel drive, which is standard in Canada and the USA), the high-performance 6.2L V8-powered CL 63 AMG (with optional performance package variant) and the ultra-luxury twin-turbo 5.5L V12-powered CL 600 and, lastly, the CL 65 AMG with a twin-turbo 6.0L V12 engine. The CL 500 is sold as the CL 550 in some markets (including the U.S.). The class is based on the chassis of the W221 S-Class, which shares the same powertrains, although there are V6 and hybrid engines for the S not available for the CL. The two-door coupé weighs , being heavier than the equivalent S saloon, and rides on a full-size 116.3-inch wheelbase (albeit 8.2 inches less than the long wheelbase S-Class, which is the only S-Class sold in the U.S.). Despite its large size, rear seat legroom is limited in keeping in the tradition of 2+2 luxury coupés, though CL has more rear passenger space than its rivals. The CL's trunk is as large as that of the Audi A8 flagship saloon.