BMW is to release a track-honed version of its M4 sports coupe with a restricted production run and a £128,820 price tag.

The M4 CSL has posted the best ever lap time for a BMW road car of 7:15.677 at the legendary Nordschleife circuit in Germany during testing.

Only 100 of the cars being produced will be available in the UK.

With a power hike of 40hp over the M4 Competition Coupe, the CSL's engine develops 550hp resulting in a 0 to 62mph acceleration time of 3.7 seconds and a top speed of 190mph.

Fuel economy is rated at 28.8mpg at best with emissions of 222g/km.

The M4 CSL is arriving as BMW marks 50 years of its M brand and with a carbon fibre roof, bonnet and boot lid is some 100kg lighter than the Competition Coupe.

As a two-seat model only the CSL also has lightweight carbon ceramic brakes, special alloy wheels and a titanium rear silencer and BMW says that track driving is its raison d'être.