Part Number: FCPPA820085 Manufacturer: FCP Engineering Forged high performance pistons for a variety of applications in almost all engine types for racing and street use. Made of 4032-T6, molybdenum coated piston bottom. Each piston kit also includes HD Series rings and pins. Cylinder bore: 82.00 mm Compression Ratio (CR): 8.5:1 Height compression: 33.00 mm Pin diameter: 20 mm Stroke: 86.40 mm Audi 200, S2, RS2, S4, S6 - 2.2 2.5 20V Turbo