Detailed product specifications Manufacturer: FCP Engineering Model: FCPRXA14450620-4 Profile: X-beam (Oil channel from housing to piston) Offset: 144 mm Housing diameter: 50.6 mm Piston diameter: 20 mm Quantity: 4 pcs, 8 pcs ARP2000 3/8" screws Made of: forged steel 4340 EN24erAdvertised power: 1000KM (4 cylinders)Advertised revolutions: 9000RPMAudi / VW / Seat / Skoda: 1.8T 20V (AEB, BAM, AWB and others) 1.8 2.0 16V (KR, PL, 9A)