With the demise of their partnership with McLaren as the F1 GTR was reaching the end of its racing career, BMW decided to delve into open-cockpit prototypes. The first attempt, the V12 LM, was underdeveloped, but this subsequent LMR version fixes many of the issues with the earlier car. The chassis is provided by constructor WilliamsF1, and the engine is a derivation of the same 6-liter V12 found in the racing versions of the McLaren F1 GTR. A simple car in theory, the carbon fiber open monocoque is very lightweight, and with a proven engine the car was incredibly quick during its career, with this #15 car winning the 24 Hours of Le Mans outright in its first year of racing to provide BMW with their first win as a principal (rather than just as an engine supplier). Mission accomplished, the V12 LMRs went to compete in ALMS racing and BMW went into Formula 1 with WilliamsF1.