BMW has introduced only two generations of the 8 Series. The initial model was available throughout the 1990s for nearly ten years before the brand shelved the nameplate for about two decades. The E31 model was discontinued due to insufficient sales, marking the end of the coupe's production, yet its elegant design remains memorable. Reyn Speed Shop has crafted a remarkable unique model that was unveiled during Monterey Car Week. Named the 858 CSL, this vehicle features several new carbon fiber body panels aimed at reducing weight and justifying the Competition Sport Lightweight designation. It also includes updated front and rear bumpers, broad fender flares, custom headlights, and a vented hood. The distinctive alloy wheels retain the original BMW center caps, offering a refined aesthetic enhancement that respects the original design while incorporating unique elements.

The one-off model replaces the original engine—which ranged from V-8 to V-12 configurations—with a 5.0-liter V-10 engine from the E60-generation M5. However, Reyn Speed Shop enhanced this engine by increasing its capacity to 5.8 liters with a longer stroke and integrating it with a six-speed manual transmission. Although Reyn did not disclose the new performance specifications, the initial E60 engines produced 500 horsepower and 384 pound-feet of torque, sold by BMW between 2005 and 2010. The increased displacement likely boosts horsepower further, though with Monterey Car Week concluded, the opportunity to view the 858 CSL in person may have passed. Nonetheless, its existence is a testament to the enduring appeal of the first-generation 8 Series.