Custom pistons from Diamond Racing straight out of the Lethal Performance 2013 GT500. We had these pistons made for high horsepower and high abuse in mind, so they are built to handle anything you can throw at them. Features 3.677" diameter, 10.3:1 compression, 22mm x .200" wall pins, gas porting and coated skirts. These pistons use a 1.2mm top ring, 1.5mm 2nd ring and 3.0mm oil ring. All of these features equate to a piston that can handle our 1200+ rwhp worth of abuse with absolute ease.