ScienceofSpeed Forged Aluminum Pistons are the most advanced forged pistons available for the NSX. This design is based on years of development with the NSX power plant. These forged pistons, manufactured from NSX-specific forgings, are designed to replace the factory cast pistons with increased strength, decreased weight, and increased performance. Pistons are available in low compression (for turbocharger and supercharger use), stock compression, and high compression (natural aspiration use). Pistons are available in popular 90.5mm size (compatible with factory 3.0L engines) and 93mm size (for sleeved 3.0L and 3.2L engines) - however, custom bore sizes are available. All pistons include Xylan skirt coating. Xylan skirt coating is a proprietary molybdenum and graphite coating that offers scuff protection and increased lubricity. Coating offers a much higher strength adhesion and tensile strength compared to standard molybdenum coatings.