RC's Performance now offers the same custom nitrous JE pistons we use, to the public so that you can build your own  nitrous motors.  This piston is built specifically for to handle large amounts of nitrous. Low compression 11:1 CR  coated skirt and premium ring set. Wrist pin diameter is 15mm (.591") We recommend our stainless steel high temp nitrous valves in nitrous setups producing  50HP or greater as well as hd valve springs.