Working closely with CP, these pistons meet VAC's most stringent expectations and are the finest available, anywhere. Others agree; you can find these same pistons in most of the world's most powerful race and street engines.Be sure to specify compression ratio when ordering above. Custom orders available by request.- Made from the best forgings available for uncompromising reliability and performance- Made to the most accurate tolerances in the industry- Many pistons look alike. However, CP and VAC have come together to engineer pistons with perfect compatibility with each BMW application.- Clearanced for popular camshaft applications and oversized valves- All specs based on the experience of hundreds of BMW S63 builds- Sold in matched and balanced sets of 8- Supplied with ultra-high quality ring sets, lightweight pins, and locks