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The JE Pistons BMW S52B32US 11.5KIT is a set of six high-performance forged pistons designed for the BMW S52B32 engine. Made from strong 2618 aluminum, these pistons offer exceptional durability and strength for demanding applications. The proprietary Forged Side Relief (FSR) design minimizes friction and power loss by reducing skirt width and using a shorter, lightweight wrist pin. Depending on the application, the pistons may feature a skirt coating to reduce friction, wear, and operating noise. An accumulator groove, where applicable, helps manage combustion gas pressure, reducing ring flutter and improving the ring seal for consistent power output. The set includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings. With a bore size of 3.425 inches and an 11.5:1 compression ratio, these pistons are engineered to deliver optimized performance and durability.