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Maintenance-free operation with no need for watering or equalizing
2006 Subaru WRX STI (GD)
The compression has a modest increase as well
Oil-pressurized for improved ride comfort and handling response
GSC Power Division GSC Valve Spring Kits | Subaru EJ (5074) GROUP_GMC Maintenance-free operation with no needGSC Power Division GSC Valve Spring Kits Part #: 5074 Overview The GSC Power Division Valve Spring Kit for Subaru EJ engines is a high performance upgrade designed to enhance the durability and reliability of your engine under demanding conditions. Crafted specifically for Subaru EJ models from 2000 to 2025, this kit is ideal for enthusiasts and builders aiming to support aggressive cam profiles, high RPM operation, and elevated boost levels. Whether
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