Part number: FCPPA815085/Manufacturer: FCP Engineering Forged high performance pistons for a variety of applications in almost all engine types for racing and road use. Made of 4032-T6 material, molybdenum coated piston bottom. Each piston kit also includes HD series rings and pins. Diameter cylinder: 81.50 mm Compression ratio (CR): 8.5:1 Compression height: 33.00 mm Pin diameter: 20 mm Stroke: 86.40 mm Audi 200, S2, RS2, S4, S6 - 2.2 2.5 20V Turbo