Part number: FCPPASTR820095 Manufacturer: FCP Engineering Forged high performance pistons for a variety of applications in almost all types of engines for racing and street use. Made of 4032-T6 material, molybdenum coated piston bottom. Each piston kit also includes HD series rings and fittings. Cylinder diameter: 81.50 mm Compression Ratio (CR): 9.5:1 Compression height: 29.00 mm Link diameter: 22 mm Stroke: 95.50 mm with an engine block with a stroke of 236 mmAudi 200, S2, RS2, S4, S6 - 2.2 2.5 20V TurboPiston length must be 159mm