“CSL” stands for “Coupé Sport Leichtbau” (coupé, sport, lightweight). With its aluminium bonnet, boot and wings, Plexiglas windows and equipment rigorously pared down to the bare essentials, the old BMW 3.0 CSL tipped the scales around 200 kg lighter than its sibling model, the BMW 3.0 CS. Unsurprisingly, then, it was predestined for a career on the race track. Whereas the material of choice in the 1970s was aluminium, today carbon fibre – or carbon-fibre-reinforced plastic (CFRP) – offers the optimum weight-to-strength ratio. These high-strength fibres are even lighter and stronger than aluminium.