properties ultra lightweight designed for maximum weight reduction requirements ... compression high compression required for optimum performance process composite ... casting patented process superior dimensional ... tolerances and minimal core shift stainless steel ... tensile strength high strength designed for maximum strength <9.5 low compression ... lower compression required for optimum performance exhaust upgrade ... higher exhaust flow required for optimum performance fuel upgrade ... injector regulator or pump upgrade for optimum performance valvetrain upgrade ... valve spring and ti retainer upgrade for optimum performance ecu upgrade ... timing air-fuel increased rpm levels for optimum performance casting precision ... oem quality shell molding die casting or investment casting forging precision ...