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This Ferrea dual special alloy valve spring set is specified for Subaru STI engines and supplied as a set of 16 for full head service. Intended for applications that require dual-spring configurations, the set supports head rebuilds or valvetrain upgrades by replacing all springs to maintain consistent valve control across cylinders. Use the set when renewing springs for balanced valvetrain performance.
Ferrea Subaru STI Dual Special Alloy Valve Spring - Set of 16
