Stage 1: stock engine/filters, stock/modified pipes about a 5% power increaseStage 2: stock/mild modified engine, stock/modified pipes, stock/modified filters about an 8% power increaseIncreases power and drivabilityFully adjustable MaterialBrassProduct NameJet KitTypeStage 1, Stage 2UnitsKitVendor part numberQ427 MakeModelDisplacementYearCountryEngineYAMAHAYFZ 450 4502006AMERICAYAMAHAYFZ 450 4502007AMERICAYAMAHAYFZ 450 4502008AMERICAYAMAHAYFZ 450 4502009AMERICAYAMAHAYFZ 450 R 4502009AMERICAYAMAHAYFZ 450 BB Bill Ballance Edition4502006AMERICAYAMAHAYFZ 450 BB Bill Ballance Edition4502007AMERICAYAMAHAYFZ 450 SE Special Edition4502007AMERICAYAMAHAYFZ 450 RSE Special Edition4502009AMERICAYAMAHAYAMAHAYAMAHAYAMAHAYAMAHAYAMAHAYAMAHAYAMAHAYAMAHAYFZ 450 YFZ 450 YFZ 450 YFZ 450 YFZ 450 R YFZ 450 BB Bill Ballance EditionYFZ 450 BB Bill Ballance EditionYFZ 450 SE Special EditionYFZ 450 RSE Special Edition450450450450450450450450450200620072008200920092006200720072009AMERICAAMERICAAMERICAAMERICAAMERICAAMERICAAMERICAAMERICAAMERICA