GSC 5743 Single Valve Spring Kit Ti Retainers for 02-21 Subaru WRX/STI EJ20/EJ25

Vehicle Fitment

• 2002-2021 Subaru WRX, EJ Turbo Series (EJ205/EJ255)
• 2004-2021 Subaru STI, EJ Turbo Series (EJ207/EJ257)

Fitment Notes

• Best for daily-driven builds keeping boost and revs moderate
• Compatible with GSC1005 OEM-style replacement spring seats
• Sold as a set of 16

Features

• Single cylindrical valve spring design
• Same quality/consistency as GSC's popular beehive spring kit
• Nano-peened AS50 round wire
• CNC machined titanium retainers
• Strict quality control for reliable valvetrain control
• Rated for S1 or S2 profile camshafts

Specifications

• Seat pressure: 75-78 lbs
• Open pressure: 184-197 lbs (varies by cam profile/lift)
• Coil bind: 0.845"
• Install height: 1.326"
• Max valve lift: 0.421"
• Max boost: 32 PSI
• Max RPM: 8,200 (with S1/S2 profile cam)
• Retainer material: Titanium, CNC machined

Included Components

• 16x Single Valve Springs
• 16x Titanium Retainers

Product Description

GSC's Single Valve Spring Kit brings genuine upgraded valvetrain control to the Subaru EJ Turbo Series, built for the WRX/STI owner who daily drives their hot rod while keeping boost and revs in check. Using the same quality and consistency as GSC's popular beehive spring kit, this cylindrical design features nano-peened AS50 round wire rated to handle 8,200 RPM and boost levels up to 32 PSI when paired with an S1 or S2 profile camshaft.

Strict quality control on both the springs and the CNC machined titanium retainers gives real peace of mind that the valvetrain stays under control at elevated RPM and boost. Compatible with GSC's OEM-style replacement spring seats (GSC1005) for a complete, properly matched valvetrain upgrade.

Sold as a complete set of 16 springs and 16 titanium retainers -- everything needed for a full DOHC EJ turbo cylinder head.