ARP Custom Age 625+ Head Stud Kit – Ultimate Strength for Subaru WRX/STI & More -

Maximize clamping force and prevent head gasket failure in your 2002-2014 Subaru WRX, 2004-2020 STI, and compatible models with ARP Custom Age 625+ 11mm Head Studs. This high-performance alloy is significantly stronger than stock head bolts, essential for high-boost and racing builds. Custom Age 625+ alloy for superior strength and fatigue resistance Handles extreme pressure for reliable head gasket sealing Prevents blown head gaskets even under the most demanding conditions Kit includes 11mm studs, hardened parallel-ground washers, and ARP assembly lube Features: 260,000-280,000 psi tensile strength for unmatched durability Precision machined for perfect fitment and reliability Reusable and trusted by professional engine builders