The E90 debuted as a saloon (E90) and touring (E91) in March 2005, while the coupé (E92) and a retractable hard-top convertible (E93) went on sale in August 2006.[citation needed] The coupé-cabriolet body was now its own design and no longer derived from the saloon-touring (unlike its predecessors).[citation needed] The retractable hard-top convertible, meanwhile, was a first for the 3 Series., , The E90 was available with four-cylinder and six-cylinder engines, and the E92 M3 used a V8 engine. The first turbocharged petrol 3-series was the E92 335i, which uses the BMW N54 straight-six. The N52 naturally aspirated inline-six engine features a lightweight magnesium-aluminum construction, electric water pump, and Valvetronic variable valve lift., , In 2007, a record total of more than 550,000 vehicles were sold and it was the seventh most popular car in the United Kingdom.[4]