For legions of BMW enthusiasts, the stellar Paul Bracq-designed E24 6-series coupe, introduced in 1976 to replace the outgoing 3.0 CS and CSL models, remains one of the marque’s finest models. In 1983, BMW unveiled the ultimate specification of the series, designated the M635CSi. Specially outfitted by BMW’s “M” (Motorsport) division with the 3.4-liter DOHC six-cylinder engine of the M1 supercar, the M6 (as it was named in the U.S.) remains both the ultimate high-speed BMW of the 1980s and an enduring performance and status symbol of its era.

Only 4,088 examples of the M635CSi, or M6, were produced between 1983 and 1988. In addition to the uprated DOHC 24-valve six-cylinder engine of the M1, the M635CSi included a deep front air dam, sport suspension and limited-slip rear differential, as well as a set of fat Michelin TRX tires on alloy wheels. Optional amenities included rich Nappa leather upholstery, alternatively known to BMW aficionados as ‘Buffalo hide,’ power-operated front seats, a dedicated rear air-conditioning unit and even a central beverage chiller.

This car was auctioned off by RM Auctions in January of 2011 at the Arizona Biltmore Resort & Spa, Phoenix, Arizona.

282 bhp, 3,453 cc DOHC inline six-cylinder engine with four valves per cylinder and electronic (port) fuel injection, five-speed manual transmission, independent front suspension with MacPherson struts, lower lateral links, coil springs and anti-roll bar, independent rear suspension with semi-trailing arms, coil springs and anti-roll bar, and four-wheel hydraulic disc brakes. Wheelbase: 103.5"

Source:RM Auctions