Ferrea Endurance Dual Spring Kit for Subaru WRX STI

Ferrea Subaru WRX STI Endurance Dual Spring Kit

Ferrea SKU: FERKT4020
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This Ferrea Dual Valve Spring Kit is an endurance-spec upgrade for the Subaru WRX STI (EJ-series), designed to maintain consistent valve control and resist load loss under sustained boost and high rpm. Sold as a complete kit.

Brand Ferrea
Type Dual valve spring kit (endurance)
Application Subaru WRX STI (EJ-series)
Part Number KT4020
Use Endurance / boosted valvetrain upgrade
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