The CSL was rolled out along with the M 1000 RR 50 Years M motorcycle to mark the 50th anniversary celebrations of the company's motorsports arm.
Only 1,000 units of the car would be made at BMW's Dingolfing plant from July. It made its world premiere at the Villa d'Este concourse in Italy on May 20.
CSL stands for "Competition, Sport, Lightweight". It references the role of weight-minimised design in achieving success in motorsport.
The 3.0 CSL developed by BMW Motorsport GmbH according to this same principle won the European Touring Car Championship at the first attempt in 1973.
And the M4 CSL is also following in the tyre tracks of special-edition models from earlier generations of the M3/M4, most notably the M3 CSL from 2003 and the M4 GTS of 2016.
The car will have it world premiere at to mark the 50th anniversary celebrations of company's motorsports arm.
It weighs 1,625kg and boasts a standout power-to-weight ratio of 2.95 kilograms per hp.
Fitting M Carbon full bucket seats reduced weight by around 24kg on its own compared with the standard seats installed in the M4 Competition Coupe.
Removing the rear seats and seat belts, integrating a partition and making the associated modifications to the luggage compartment saved 21kg.
Other changes to lighten the car further includes use of carbon fibre roof, special alloy wheels, M Carbon ceramic brakes, titanium rear silencer and reducing the soundproofing materials.
The body of the BMW M4 CSL is painted in the exclusive Frozen Brooklyn Grey metallic as standard. This exterior shade teams up with exposed carbon-fibre surfaces and red accents to create a visually expressive appearance of sporting purity.
Alternatively, customers can specify their new M4 CSL in Alpine White solid or Sapphire Black metallic.
The carbon-fibre structure of the body components is visible in various areas, including the two chiselled indents in the bonnet.
The optionally available BMW Laserlight headlights bring another head-turning accent to the front end of the M4 CSL. Both in the
When the low and high beam are switched on, these headlights illuminate in yellow rather than white, bringing to mind the look of successful GT racing cars.
The LED rear lights of the new BMW M4 CSL are equipped as standard with technology making its debut in a series-produced car.
Their glass covers have intricate light threads woven into them which are illuminated using laser technology, bringing a vibrant structure to the surface of the lights.
This creates a highly distinctive light signature that is recognisable from a long distance at night.
The M4 CSL comes with the same high-revving, six-cylinder in-line engine with M TwinPower Turbo technology found in the M4 GT3 racing car.
The M4 CSL's engine develops peak torque of 650Nm between 2,750 and 5,950 rpm. Its maximum output of 405 kW/550 hp is produced at 6,250 rpm.
The M4 CSL goes from 0-100kph in 3.7s and from 0-200kph in 10.7s. Top speed is 307kph.
The race-derived design of the 3.0-litre engine is focused squarely on high revs and maximum power development.
The crankcase's sleeve-free, closed-deck construction helps to make it extremely rigid, while the forged lightweight crankshaft allows it to handle extremely high levels of torque.
Another special M-specific feature is the cylinder head core made using 3D printing techniques.
Both the cooling and oil supply systems are designed to handle the particular challenges presented by track driving.
The twin-tailpipe exhaust system with electrically controlled flaps and lightweight titanium rear silencer additionally generates a racing-car-inspired, emotionally engaging engine note.
The drive torque produced by the engine is relayed to the rear wheels of the car via an eight-speed M Steptronic transmission with Drivelogic.
BMW said model-specific mountings for the engine and transmission ensure the engine's power is translated into dynamic performance in rapid and direct fashion.
BMW said the firmer connection of the engine and transmission to the car's structure is perceptible, especially under hard driving.
Standard equipment list for the special-edition model are adaptive M suspension with electronically controlled dampers, electromechanical M Servotronic steering with variable ratio and M Carbon ceramic brakes.
An M-specific version of the integrated braking system is said to offer the driver excellent pedal feel even when pushing the dynamic limits and in adverse road conditions.
The standard-fitted M Traction Control function with model-specific track tuning lets the driver set individual intervention thresholds for wheel slip limitation.
On dry surfaces, stages 1 to 5 of M Traction Control help the driver to execute controlled drifts. Stages 6 to 10 are based on the application developed for touring car racers and make allowance for both surface conditions and tyre temperature to maximise traction and directional stability.
Also specified as standard are forged M light-alloy wheels in an exclusive cross-spoke design (19 inches at the front axle and 20 inches at the rear).
These are fitted with high-performance tyres specially developed for the special-edition model in size 275/35 ZR19 (front) and 285/30 ZR20 (rear).
> BMW M4 CSL SPECIFICATIONS (pdf)