Part number: FCPPA825085 Manufacturer: FCP Engineering Forged diesel pistons for a variety of applications in almost all engine types for racing and street use. Made of 4032-T6, the bottom of the piston is molybdenum coated. Each piston set also includes HD series rings and pins. Cylinder diameter: 82.50mm 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