ARP 2000 VW/Audi 2.0L (FSI/TFSI) 4-cylinder Main Stud KitAUDI FSI TFSI Main Studs These head stud kits feature premium grade ARP 2000 material (that is rated at 220000 psi tensile strength. These are a direct replacement for the OEM head bolts. No drilling and tapping of the cylinder block required. They are heat treated prior to thread rolling and machining and are rated at a whopping 220000 psi. The pro series kits are also available with 12 point nut, and all kits come complete with hardened parallel