CP Piston BMW S58B30 Pistons STD Bore (84mm) 9.3:1 - Set Of 6

This set includes six CP Pistons forged pistons, designed for BMW S58B30 engines. Each piston has a standard bore size of 84mm and a compression ratio of 9.3:1. These pistons are built for performance applications where increased strength and reliability are needed over stock components.

CP Pistons are well-known for their robust construction, utilizing high-strength aluminum alloys and advanced forging techniques. This process creates a piston that is significantly stronger and more durable than cast pistons, making them ideal for high-boost or high-RPM environments. The specific design for the S58B30 engine ensures proper fitment and performance characteristics, including the 9.3:1 compression ratio which offers a good balance for forced induction setups. The standard 84mm bore means these are a direct replacement for stock-sized bores, simplifying installation if the engine block is not being bored out.

When rebuilding or significantly upgrading an S58B30 engine, forged pistons like these are a critical component for handling increased cylinder pressures. It's important to note that these pistons are not CARB approved and cannot be shipped to California. Always consult with your engine builder or mechanic to ensure these pistons are the right choice for your specific build and to follow proper installation procedures.