ARP High Performance Series main bolts are rated at 180,000 psi and a popular premium replacement for OEM fasteners. ARP Case Bolt Kit Subaru EJ25 EJ20 designed to meet the exacting standards and demands of professional engine builders, ARP bolts are forged from 8740 chromoly steel and feature a reduced wrenching head, large underhead radius, and rolled threads for the utmost in reliability. The threads are rolled after heat-treating which gives them about 2,000 percent better fatigue strength than most main bolts that are threaded prior to heat-treating. Hardened parallel-ground washers are included with each kit.
 
Vehicle Fitment:Subaru EJ20/EJ25• 2002-2014 WRX• 2004-2021 STi• 1998-2005 Impreza RS• 1994-2012 Legacy GT• Also fits some Forester, Baja and Outback models
 
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