Half a century ago, BMW’s M department began producing some of the best cars from the Bavarian manufacturer. Among them, three models that officially had the CSL label stand out, the original 3.0 CSL, M3 CSL (E46) and M4 CSL. However, it is less known that BMW worked on four CSL prototypes that never went into production, the E46, E60, E63 M6, and perhaps the ultimate BMW M2 CSL (F87).

The BMW M5 CSL (E60 sedan) is powered by a 5.7 liter V10 engine with 621 hp (457 kW). The engine volume has been increased from the original 5.0L and the result is a Formula 1 car-like sound. The engine is paired with a dual-clutch transmission, and the overall weight of the car is reduced by 150 kg.

The F87 M2 CSL prototype is powered by an improved engine with 450 hp (331 kW) and 406 lb-ft (550 Nm) torque. It is equipped with a carbon rear spoiler and carbon-ceramic brakes.

The BMW E63 M6 is similar to the M5 CSL model with 100 kg less. It uses the same 5.7 liter V10 engine. The only difference is in the aerodynamics that ensure better airflow. It is equipped with a movable front splitter, active rear wing and aerodynamic side mirrors.

The BMW E46 is powered by a 5.0-liter V8 engine from the E39 M5, which means it has 400 hp (294 kW) and 369 lb-ft (500 Nm) of torque at 3,800 rpm. The engine is paired with a six-speed manual transmission.

Source: BMW