ARP 2000 Head Stud Kit WRX/STI (EJ)

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Description ARP uses a premium grade 8740 alloy that is rated far superior to "aircraft" quality. Then, each stud is placed vertically in special racks and precisely heat-treated t o 200,000 psi.ARP studs are thread rolled after heat-treat, which gives them about 1000% (that's ten times) better fatigue strength than those studs that are threaded prior to heat-treat (a very common industry practice). It costs a lot more to do it this way, because it's tough on tooling, but the results are well worth the extra effort. Specifications Fastener Style - Stud Undercut Stud - No Head Style - 12-point Fastener Material - 8740 Chromoly Fastener Finish - Black Oxide Washers Included - Yes Cut to Fit - No Download Installation Instructions Show more