.Now fits all years of Hayabusa when using the included Spacer Kit (a $24.99 value.)Spacer kit allows a Gen 2 Hayabusa Alien Head 2 exhaust to be used on a Gen 1 Hayabusa (99-07) without any permanent modification. Spacer kit not required for Gen 2 models.14" megaphone mufflerShow-polished finishHigh flow flange kitMaximized power gains on stock and modified engines2.25" outlet permanent baffleLarger diameter outlet provides increased exhaust flowDistinctive look/aggressive sound(2.25” optional noise reduction insert sold separately)No fairing modifications requiredAerospace quality, ultra lightweight stainless constructionIncludes (Emissions/PAIR) Block Off Cap and instructions for decel-pop reduction3oz. tube of Permatex Ultra Copper® supplied with purchaseIncludes Brock’s lifetime direct support package At no additional chargeSelect from increased drivability/fuel mileage (pump gas) or race-proven (race fuel) track maps via our map support program At no additional charge