ARP 2000 Cylinder Head Stud Kit – Subaru WRX, STI, Forester XT, Liberty GT (EJ20/EJ25)

ARP Cylinder Head Stud Kit – Subaru WRX, STI, Forester XT, Liberty GT (EJ20/EJ25)

There’s a reason top engine builders trust ARP Pro Series head studs for their high-performance Subaru EJ20 and EJ25 builds — nothing else offers the same precision, durability, and reliability under pressure. Whether it’s a street build or a competition-spec setup, ARP studs deliver clamping force you can count on to prevent head lift and seal combustion pressure effectively.

Key Features

• Made from premium-grade 8740 chrome moly steel, rated far above "aircraft quality"
• Heat-treated to 200,000 psi for unmatched strength and durability
• Vertically racked for consistent heat penetration — not batch dumped
• Centerless ground for perfect concentricity and alignment with heads and gaskets
• Thread-rolled after heat treatment for up to 10× the fatigue strength of cheaper studs
• Includes undercut shorter studs for even stretch and optimal clamping force
• Complete kit includes studs, 12-point nuts, hardened washers, and ARP Ultra-Torque lubricant

Why Choose ARP for Your EJ Build?

ARP doesn’t cut corners. While others thread studs before heat treatment or skip essential processes, ARP builds each stud to exacting standards. This ensures precise cylinder head alignment, reduces risk of blown gaskets, and provides consistent torque loading even under extreme heat and pressure. The result? A cylinder sealing solution trusted by championship-winning teams worldwide.

Vehicle Compatibility

• Subaru WRX (EJ20/EJ25)
• Subaru WRX STI (EJ25)
• Subaru Forester XT (EJ25)
• Subaru Liberty GT / Legacy GT (EJ20/EJ25)

ARP studs are stamped for authenticity — don’t settle for inferior fasteners in your engine build.

Download Install Instructions (PDF)