GSC 5076 Conical Spring Kit for 02-14 WRX/04-21 STI EJ20/EJ257

Vehicle Fitment

• 2002-2014 Subaru Impreza WRX (EJ205/EJ255 turbo, AWD)
• 2004-2021 Subaru Impreza WRX STI / Subaru STI (EJ207/EJ257 turbo, AWD)
• Fits Subaru Turbo EJ platforms with compatible EJ20/EJ25 turbo cylinder heads
• Includes legacy GD/GG, GR/GV, and VA-chassis STI applications where EJ-series turbo heads apply
• AWD applications confirmed; no FWD or RWD vehicle coverage verified
• Not confirmed for FA20DIT, FA24F, FB-series, EZ-series, or naturally aspirated EJ applications
• Platform confirmed as Subaru Turbo EJ only; vehicle-level fitment should remain tied to EJ turbo head compatibility
• Fitment confirmed through 2021. 2022-2025 coverage unconfirmed at time of listing.

Features

• GSC Power-Division conical valve spring kit with titanium retainers and chromoly seats
• Designed for Subaru Turbo EJ platforms
• Single conical spring design reduces valvetrain mass compared with many dual-spring setups
• Includes titanium retainers for lighter valvetrain control
• Includes chromoly spring seats for proper installation
• Rated by GSC for up to 10,000 RPM
• Rated by GSC for up to 40 psi boost
• 84 lbs seat pressure at 1.318 in. installed height
• 233 lbs open pressure at 0.868 in.
• Maximum valve lift rating of 0.450 in.

Specifications

• Part Number: 5076
• Brand: GSC Power-Division
• Product Type: Conical valve spring kit
• Engine Compatibility: Subaru Turbo EJ platforms
• Installed Height: 1.318 in.
• Coil Bind Height: 0.807 in.
• Seat Pressure: 84 lbs
• Open Pressure: 233 lbs @ 0.868 in.
• Maximum Valve Lift: 0.450 in.
• Maximum RPM / Boost: 10,000 RPM / 40 psi

Included Components

• 16x titanium retainers
• 16x conical valve springs
• 16x chromoly valve spring seats

Product Description

The GSC 5076 is a conical valve spring kit with titanium retainers and chromoly seats for Subaru Turbo EJ platforms. GSC's own product listing identifies this kit specifically for Subaru Turbo EJ applications, and the strongest cross-validated fitment points to EJ-series turbo WRX and STI models rather than non-turbo EJ or newer FA/FB engine families. This makes it a valvetrain upgrade for properly matched EJ20 and EJ25 turbo cylinder heads used in performance street and race builds.

GSC lists this kit with an installed height of 1.318 inches, 84 pounds of seat pressure, 233 pounds of open pressure at 0.868 inch, 0.807 inch coil bind height, and 0.450 inch maximum valve lift. GSC also states maximum operating targets of 10,000 RPM and 40 psi boost. The kit includes 16 conical valve springs, 16 titanium retainers, and 16 chromoly spring seats, providing a complete spring-and-retainer package for EJ turbo cylinder head builds.

This product does not change vehicle ride height, so no front or rear lift/drop height applies. Fitment is confirmed for Subaru Turbo EJ applications through the last EJ-powered STI model years commonly cross-listed by trusted retailers. 2022-2025 coverage is unconfirmed at time of listing, and this part should not be assigned to FA20DIT, FA24, or naturally aspirated EJ applications without separate confirmation.