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Supertech titanium retainer for BMW S54 M3 specified for use with SPR-2521 and sold excluding OEM shims per the source. This retainer matches the S54 spring geometry and provides a lightweight retention option for builders assembling compatible S54 valve springs and keepers, helping reduce reciprocating mass while maintaining correct spring seating.
Supertech Titanium Retainer for BMW S54 M3 (for SPR-2521 Excl OEM Shims / Drop Ship Only)
