Detailed product specifications Manufacturer: FCP Engineering Model: FCPRX16456820-6 Profile: X-beam (oil channel from large end to piston) C to C distance: 164mm Large end diameter: 56.8mm Piston diameter: 20mm Quantity: 6 pcs, 12 pcs ARP2000 5/16" screws Made of: forged steel 4340 EN24er Announced power: 1200 HP (6 cylinders) Announced maximum rotational speed: 9000 rpmVW Corrado, Golf, Jetta, Passat; Audi A3, TT - 2.8 2.9 VR6 R32