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The Supertech dual valve spring kit for BMW S54 includes paired springs supplied with SEAT-BMS55 as indicated, forming a matched kit for S54 cylinder-head service. Designed for complete head work or rebuilds, the kit provides the dual-spring components and the specified seat reference to support consistent fitment and valve-train function on S54 applications.
Supertech BMW S54 Dual Valve Spring Kit (w/SEAT-BMS55)
