Part Number: FCPPASTR825085 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 material, the bottom of the piston is molybdenum coated. Each piston kit also includes HD series rings and piston hinges .Cylinder diameter: 82.50mm Compression ratio (CR): 8.5:1 Compression height: 29.00 mm Hinge diameter: 22 mm Stroke: 95.50 mm with 236 mm stroke engine block Audi 200, S2, RS2, S4, S6 - 2.2 2.5 20V Turbo Connecting rod length must be 159 mm