JE Pistons BMW S50B30US 12.5KIT Set of 6 Pistons

If you're rebuilding the engine in your BMW S50B30US for serious performance, a set of high-quality forged pistons is a critical component. JE Pistons has been making top-tier forged pistons for decades, and this set is built specifically for your engine. They're forged from 2618 aluminum, a material known for its high tensile strength, which is exactly what you need when you're pushing an engine hard.

What sets these pistons apart is their design, like the proprietary Forged Side Relief (FSR) forging. This design helps reduce friction and skirt wear, saving a bit of weight and potentially improving power. Depending on the specific application, you might also find an accumulator groove to help manage combustion pressure and improve ring seal, along with a skirt coating to further reduce friction and noise. Every part of this kit, from the pistons themselves to the included wrist pins, locks, and JE Pro Seal premium rings, is made 100% in the USA.

This kit is designed for a 3.406-inch bore and offers a 12.5:1 compression ratio, which is a notable increase over stock, making it suitable for naturally aspirated builds or those looking for more power. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.