The C2 /1 2.7 used the 325e eta model engine block, crank and rods, but with custom flat head pistons provided by Mahle. Originally Alpina modified the "200" casting number cylinder head specific to the 325e with bigger intake valves, larger air intake ports, and redesigned the valve chamber for better flow. A more aggressive camshaft was used, with higher lift and duration, and harder valve springs were installed. Compression ratio was increased to 10.2:1. The C2/1 2.7 made with of torque and was the fastest E30 available at the time ( top speed). 108 cars were built.