Alfa Corse also prepared and entered a single 8C 2900B, chassis number 412033, for the 1938 Le Mans. The car featured a streamlined coupé body at a time when Le Mans racers were almost always open cars. The aerodynamic coupé was built by Carrozzeria Touring. In 1987, an Italian magazine had the car tested at the Pininfarina wind tunnel, where a Cx of 0.42 was measured, down to 0.38 with air intakes closed. The coupé, driven by Sommer and Biondetti, led for most of the race, but tyre trouble was then followed by a dropped valve. The car was driven to the pits, but had to retire there. At the time the valve dropped, the coupé had a lead of more than 160 km over the next car.
This was the only time the coupé was raced by Alfa Corse. After the war, it was entered in minor races under private ownership, was then displayed at the Donington museum from the 1960s before being added in 1987 to the Alfa Romeo museum, which now runs it at many events.