ARP Head Stud Kit for Subaru Impreza WRX STi 2.0L EJ20 2.5L EJ25 2.5L EJ257 SOHC

ARP Pro Series ARP2000 studs are centerless ground, heat treated prior to thread rolling and machining, and are nominally rated at 220,000 psi. These fasteners deliver a 40% increase in tensile strength over the OEM Torque to Yield (TTY) bolts. All bolts are precision centerless-ground and thread-rolled to Mil-S-8879 specs. Each utilizes a black oxide finish that protects them from wear and corrosion. All kits come complete with hardened parallel washers for even load distribution and accurate torque readings.