Yeah must of been fast as hell, but according to Mickey, the 5 to 8 HP difference between the 446 and the 500 wasn't worth the almost $1000 dollors more. Remember you needed a 400 Kodiak cylinder, and connecting rod, which he bought new, then bore the new cylinder out to to accept a 90mm sleave, plus stroke the stock Warrior crank. The Kodiak cylinder looks to be like 8mm higher.