CP Piston BMW S58B30 Pistons STD Bore (84mm) 9.3:1 - Single

CP Pistons is well-known for making strong internal engine components, and these forged pistons for the BMW S58B30 engine are a prime example. If you're rebuilding the top end of your S58B30, these pistons are built to handle increased stress and power. They come in a standard bore size of 84mm, which is what you'd expect for a fresh build or rebuild where the cylinders are still in good shape.

These pistons feature a 9.3:1 compression ratio, a solid choice for many performance applications that aim for improved power without sacrificing too much drivability. The forged construction means they are made from a solid block of aluminum that's heated and hammered into shape, making them significantly stronger and more durable than cast pistons. This strength is crucial for engines that see higher boost pressures or more aggressive tuning. Each piston is sold individually, so you can order exactly the number you need for your specific engine build.

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.