One-Off BMW 858 CSL V10 8 Series Restomod e31

The BMW 858 CSL is a one-off restomod based on the E31 8 Series, featuring a stroked 5.8-liter V10 engine from the E60 M5, producing an estimated 630 horsepower. It includes an extensive carbon fiber body, a six-speed manual transmission, and interior components blended from other BMW M models, such as the E39 M5 front valance and E30 M3-inspired flared arches.
Engine and performance
Engine: A stroked 5.8-liter version of the BMW E60 M5's S85 V10 engine.
Horsepower: Approximately 630 hp.
Torque: Around 489 lb-ft.
Transmission: A six-speed manual gearbox.
Exterior and body
Body: A full carbon fiber body kit that reduces weight by about 689 lbs.
Fenders: Flared arches inspired by the E30 M3.
Front: A front valance inspired by the E39 M5 and custom front bumper with vents instead of pop-up headlights.
Rear: An integrated ducktail spoiler and a carbon fiber diffuser with quad exhaust pipes.
Color: Painted in Silver Grey Metallic, a color also found on the E46 M3 and E46 CSL.
Interior and features
Seats: E36 M3 "Vader" seats.
Steering Wheel and Gauges: Taken from the E60 M5.
Infotainment and Controls: A mix of classic E31 elements with a modern infotainment screen, climate controls, and other buttons from the E60 M5.
Design inspiration
The "858 CSL" name comes from the stroked engine size (5.8L) and the classic "Competition Sport Lightweight" designation.
The design intentionally blends elements from multiple iconic BMW M models to create what a modern M8 could have been. ‪@BMW‬ ‪@bmwhandokmotors‬ ‪@bmwkorea‬ ‪@deutschmotors‬ ‪@BMWM‬ ‪@bmwmotorrad‬ ‪@BMWDoctor‬ ‪@Ferrari‬ ‪@LamborghiniSquadraCorse‬ ‪@Mercedes-AMG‬ ‪@astonmartin‬ ‪@Formula1‬ ‪@MercedesBenz‬ ‪@Porsche‬ ‪@McLaren‬ ‪@mbusa‬
The BMW 858 CSL is a custom restomod of a classic E31 8 Series, not an official factory model produced by BMW. Created by Reyn Speed Shop and featuring bodywork by designer Jon Sibal, it is a one-of-a-kind, high-performance vehicle.
Performance
The build focuses on significant performance upgrades, transforming the luxury grand tourer into a high-performance machine.
Engine: The original V12 engine was replaced with a stroked 5.8-liter V10, sourced from an E60 M5.
Horsepower: Estimated at around 630 hp.
Torque: Estimated at 489 lb-ft.
Transmission: A six-speed manual transmission provides an engaging, hands-on driving experience.
Weight reduction: Extensive use of carbon fiber for the body, including the widebody kit, reduces the car's weight by 689 lbs (313 kg), bringing the total weight down to approximately 1,500 kg.
Suspension: The car rides on a Moton four-way adjustable suspension.
Brakes: Braking is handled by Brembo GTS calipers with carbon-ceramic rotors.
The BMW 858 CSL by Reyn Speed Shop is a stunning ...
Jul 28, 2025The BMW 858 CSL by Reyn Speed Shop is a stunning restomod of the classic E31 8 Series, blending its iconic design with...
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Exterior design
The design incorporates styling cues from classic and modern BMW M cars while enhancing the aggressive look of the E31 chassis.
Body: A carbon-fiber widebody kit, designed by Jon Sibal, enhances the car's aggressive stance and adds about 8 inches of width.
Paint: The car is finished in Silver Grey Metallic, the same color used on the E46 M3 CSL.
Wheels: It features custom-made ALP-001 wheels inspired by classic Alpina and E46 M3 CSL designs.
Lighting: Custom LED exterior lights replace the original E31 units.
Aerodynamics: The exterior includes flared arches from the E30 M3, a front valance from the E39 M5, and a rear spoiler inspired by the E46 M3 CSL. It also has a carbon-fiber rear diffuser.
Interior features
The interior is a blend of classic E31 aesthetics with modern BMW components for functionality and improved ergonomics.
Seats: The cabin features black Nappa leather and "Vader" bucket seats from an E36 M3.
Controls and electronics: The steering wheel, instrumentation, and many controls are sourced from an E60 M5. An iDrive screen and push-button start were also integrated.
Serviceability: The car retains its factory OBD2, CAN, and MOSTBUS functionality, allowing it to be serviced like a modern BMW.
Materials: Carbon fiber is used extensively throughout the interior, including the center console, door cards, and headliner.