ARP head stud kit for 3SGTE or the 5SGTE. Requires 12mm 12 point socket and 4mm allen wrench for installation. Fastener assembly lube and hardened washers included. Choose either the ARP 2000 with a tensile strength of 220,000 PSI or the ARP 625+ with a tensile strength of 260 - 280,000 PSI.