Part Number: FCPPB850085M50 Manufacturer: FCP Engineering Reinforced high performance pistons for a variety of applications in almost all engine types for racing and street use. Made of 4032-T6 material, molybdenum coated piston bottom. Each piston kit also includes HD Series rings and pins. Diameter cylinder: 85.00 mm Compression ratio (CR): 8.5:1Compression height: 32.50mmPin diameter: 22mmStroke: 75.00mmBMW 325 525 Turbo (M50B25, M52B25TU)Connecting rod length must be 140mm