As well as losing weight wherever possible the CSL has bespoke springs and electronically adjustable dampers, rides 8mm lower and rose joints replace much of the rubber in the rear axle.

BMW used it for the M4 CSL, a lightweight ... a lovely valley that seems far too peaceful for screaming engines. The 2.6-mile track provides a challenging mixture of corners and undulating ...

However, further illustrating the relentless pace of development, BMW’s official Ring lap time for the M4 CS is 7min 22sec (the CSL managed 7min 18sec). The Cup 2 Rs make a huge difference to ...