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JE Pistons forged kit for BMW S50B30 (86.25mm bore, 12.5:1) is a US-made, application-specific piston set engineered for racing and high-performance use. JE applies proprietary Forged Side Relief designs, optional accumulator grooves, and skirt coatings where applicable to reduce friction and improve ring seal. Each kit includes premium wrist pins, locks, and JE Pro Seal rings for a complete forged-piston solution.
JE Pistons BMW S50B30US 86.25mm Bore 12.5:1 KIT Pistons Set of 6
