Get Huge Horsepower gains with the big 3 combo including a Fuel Customs Intake, Dynojet Power Commander 6 with fuel and timing capabilities tuned for this package and an Empire Industries Exhaust system. This kit fits the YFZ 450R/X EFI models. Empire’s exhaust systems unique step pipe design pulls every bit of horsepower out of your motor and are built right here in the USA! Constructed of mandrel bent high grade 304 stainless steel. Tig welded 6061 aluminum silencer with billet end caps make for easy repacking. Empire exhaust systems offer proven Performance and are Track tested.