Detailed product specifications Manufacturer: FCP Engineering Model: FCPRXA14450620-5 Profile: X-beam (lubrication channel from tip to piston) C to C: 144 mm Tip diameter: 50.6 mm Piston diameter: 20 mm Quantity: 5 pcs, 10 pcs. ARP2000 3/8" screws Made of: 4340 forged steel EN24erAdvertised power: 1000+ HP (5 cylinders)Advertised revolutions: 9000RPMAudi 200, Quattro, S2, RS2, S4, S6 - 2.2T 20V (3B, ABY, AAN, ADU)