They're governed at 186 as is the Zx14r and all liter bikes. Kawasaki h2 is the most powerful bike available. Whatever Hayabusa you saw was probably set up for half mile or mile races. Nothing close to stock.
Can anyone that purchased a roush blower with their new car verify if insurance changes for supercharged cars or is it still considered a 5.0l according to the vin# ?