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The Supertech titanium valve spring retainer is specified for BMW S54 M3 engines and accepts 6.0mm valve stems. Offered as a high‑quality replacement retainer, it serves the core function of retaining valve springs in high‑revving applications. The description identifies application to the S54 M3 and the 6.0mm stem size; installation and compatibility should follow vehicle‑specific guidance.
Supertech Titanium Retainer for BMW S54 M3 / SPR-2521/2 / 6.0mm Valve Stems (Drop Ship Only)
