Bull Boost Performance Cylinder Head Stud Kit – Subaru WRX / STI EJ20 & EJ25 DOHC Turbo (260-4701)

Bull Boost Performance Cylinder Head Stud Kit – Subaru WRX / STI EJ20 & EJ25 DOHC Turbo (260-4701)

Part Number: 720053572339

Product Description:

Upgrade the reliability and clamping strength of your engine with the Bull Boost Performance Cylinder Head Stud Kit, designed for Subaru EJ20 and EJ25 DOHC turbo platforms. Engineered for high-performance and boosted applications, this kit delivers the strength needed to maintain proper head gasket sealing under increased cylinder pressures.

Manufactured from high-grade 35CrMo alloy steel and heat-treated to Grade 12.9, these studs offer exceptional tensile strength and durability. Whether you're building a street performance setup or a high-boost track car, this kit provides the confidence and consistency required for demanding conditions.

Designed to meet OEM specifications while improving upon factory hardware, these studs ensure precise fitment, easier installation, and long-term reliability.

Key Features:

• Premium Bull Boost Performance head stud kit
• High-strength 35CrMo alloy steel construction
• Heat-treated to Grade 12.9 for maximum durability
• Approx. 1200 MPa (174,000 PSI) tensile strength
• Black oxide finish for corrosion resistance
• Provides superior clamping force to prevent head lift
• Precision threads for accurate torque and alignment
• Open-end stud design for easier cylinder head installation and removal
• Ideal for turbocharged and high-performance builds

Fitment:

• Subaru Impreza WRX (EJ20 2.0L DOHC Turbo)
• Subaru Impreza WRX STI (EJ25 2.5L DOHC Turbo)
• Compatible with all EJ20 / EJ25 DOHC turbo engines

What’s Included:

• (12) 11mm Cylinder Head Studs
• (12) Washers
• (12) Nuts

Important Notes:

• Designed as a direct replacement for factory head bolts
• Professional installation recommended for proper torque procedure
• Always follow proper torque specs and sequence during installation

Warranty Disclaimer:

All warranties, claims, and product-related issues must be handled directly through BULL BOOST PERFORMANCE.