Utilizing the proven billet output shaft already in service in hundreds of Hayabusas around the globe, the new all billet 6 speed auto, constructed from high tensile aircraft quality steel also has a 30 mm input shaft, 3 engagement dogs instead of 4 for easier shifts and taller 5^th and 6^th gear ratios of 1.10:1 and 1:1 for more M.P.H.. It will fit in the stock engine case with no modifications or machine work necessary. Just add your choice of bearings: stock, heavy duty, or ceramics from World Wide Bearings , and you are ready to go!