245/40R20 tyres, permanently integrated sidewalls, swing-up cockpit, an LED headlight panel, silver-coloured carbon-fibre reinforced plastic body and an interior constructed from stainless steel, untreated cowhides and Lycra fabric. The vehicle was designed by Anders Warming. Model year changes 2005 Four-cylinder model (2.0i) introduced. 2006 facelift or LCI The Z4 facelift (also known as LCI) models were launched at the 2006 North American International Auto Show in Detroit. The major changes were: Introduction of Coupé models. Introduction of the M Roadster, powered by the S54 straight-six engine (the M Coupe began production a few months later, in April 2006) Discontinuation of the 2.2i model. Changing coding form i to si. Six-cylinder engines (aside from the M Roadster) upgraded from the M54 to the N52. Revised headlights, front bumper and tail lights. Availability of the six-speed automatic transmission. Inclusion of the six-speed manual transmission as standard equipment on all models. Production Over the Z4's life cycle, 197,950 vehicles had been produced, with 180,856 roadsters and 17,094 coupés. The last of the first-generation Z4 (Z4 3.0si Roadster in Space Grey) rolled off the production line on 28 August 2008. Roadsters The Z4M Roadster had a total worldwide production of 5,070, including 3,042 cars for the North American market. Coupes The worldwide model breakdown for the E86 Coupe over its life cycle (2006–2008) is 12,819 Z4 3.0si coupés, and 4,275 Z4M coupés. Even from its introduction in 2006, the Coupé was relatively rare: In its first 13 months on the market, the roadster outsold it at a ratio of 7 to 1. For the UK 3.0si coupe model, 1598 cars were produced with a manual transmission and 1998 cars with an automatic transmission. The North American (United States and Canada) production total for coupe models is 3,919, comprising 1,815 M-Coupes and 2,104 were the 3.0si Coupes. Of the 2,104 3.0si Coupes produced for the North American market, 1,276 were automatics and 828 were manual transmission; the Z4M was only available with a manual transmission. In North America, the 3.0si coupe was only available for sale in the United States although a number were imported into Canada from the US. The yearly breakdown of North American market coupe production totals are as follows: Motorsport Endurance racing Dieter Quester, Dirk Werner, Jamie Campell-Walter and Tim Mullen won the Silverstone Britcar 24-Hour race with a BMW Z4 M Coupé. The unit of the racing version is a