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Mahle MS piston set for the BMW S54B is a complete six-piece replacement set specified to 87.25mm bore with a 91.0mm stroke, 139mm connecting rod length and a 21mm wrist pin. These pistons are listed at -9.2cc with a 12.5:1 compression ratio and a per-piston mass of 354g, providing precise OEM-matched dimensions for high-revving inline-six applications where accurate tolerances matter.
Mahle MS Piston Set BMW S54B 87.25mm Bore 91.0mm Stroke 139mm Rod 21mm Pin -9.2cc 12.5 CR Set of 6
