BMW M3 (E46) CSL

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The BMW M3 CSL (Coupe Sport Leichtbau, meaning 'Coupé Sport Lightweight') is a limited edition version of the M3 that was produced in 2004, with production totalling to 1,383 cars. It was available in two colours: "Silver Grey Metallic" and "Black Sapphire Metallic".

As its name suggests, an emphasis was put on reducing weight. The CSL has a kerb weight of 1,385 kg (3,053 lb), 110 kg (243 lb) lighter than the regular M3. Structural weight reduction measures include the use of glass-reinforced plastics in various structural points in the car, a roof constructed from carbon fibre reinforced plastic (reducing kerb weight by 7 kg (15 lb) and, more importantly, lowering the centre of gravity), body panels constructed from carbon fibre and thinner glass for the rear window.
The boot floor cover was made of lightweight fibre-board (not cardboard as infamously described on the Top Gear television show). The CSL discarded a large proportion of the M3's sound insulation, the electric seats, the navigation system, the air conditioning and the stereo (the latter two were able to be re-added as no-cost options). The interior includes fibreglass front racing bucket seats, a fibreglass backing for the rear seats, and carbon fibre for the centre console, door panels, door trim and head-liner. The steering wheel has just a single button which activates the M track mode, instead of the buttons for cruise control, stereo, and phone controls on the regular M3. The CSL retained the 50:50 weight distribution of the regular M3.

The wheels were increased in size to 19 inches. BMW took the unusual approach of supplying the CSL with semi-slick tyres (Michelin Pilot Sport Cup). These tyres provided high grip levels once warmed up on a racetrack, but poor performance on wet roads and when below their operating temperature. A warning label was included in the CSL to inform drivers about driving in cold or wet conditions. The brakes were upgraded with larger floating rotors at the front and larger pistons at the rear.
The suspension system was revised with stiffer springs, upgraded shock absorbers and a quicker ratio for the steering rack (14.5:1 vs 15.4:1 on the regular M3). The electronic stability control was retuned and an "M track mode" was added, allowing higher thresholds before the system intervened.
The engine used in the CSL had increased output over the regular S54 by 13 kW (17 hp) and 5 N⋅m (4 lbf⋅ft) over the European M3. This is due to the use of sharper profile camshafts, a bigger air intake a with carbon fibre manifold, a refinement of the exhaust manifold, and slightly different exhaust valves. The top speed was electronically limited as standard, but buyers with a current motorsport licence could order the CSL with the speed limiter removed. The sole transmission available was the 6-speed SMG II automated transmission, with revised software resulting in shift times of 80 milliseconds.
The aerodynamics were also revised, including a carbon fibre front splitter that improved downforce at high speeds by 50%, and a carbon fibre rear diffuser. The front bumper had a distinct hole that is used to draw cool air into the newly designed air intake. The bootlid was redesigned to incorporate a raised lip, unlike the regular M3 where one is simply added onto a flat boot.