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The Ferrea valve spring kit for 2012–2015 Scion FR-S and Subaru BRZ models is a dual-spring upgrade that replaces stock springs to improve valve stability in more demanding applications. Suited to owners pursuing spirited driving or moderate tuning, the dual configuration helps maintain consistent valve control during repeated high-load cycles on these platform engines.
Ferrea 12-15 Scion/Subaru FR-S/BRZ Dual Spring Kit
