Dynamic Racing - 15.8:1 High Compression Piston Kit (BLOWOUT PRICING) Big performance upgrade with this piston. Substantial increase in compression, for race fuel applications only! High recommend using this with our Vortex ECU and custom tuned maps. Pro6, MR12 or equivalent should be used. Includes: -15.8:1 JE Piston (Custom undercrown milling to work with the beefy Carrillo Rod) -Wrist Pin -OEM Rings -Circlips