I got a 15 tooth clutch bell that I will try this weekend at the track. I hooked it up to my mg-66 with the go 2072 pipe. smooth,but seems to have more response down low with out the wheeling [could be new clutch shoe's] But for my 808 2010 I still like the mg,086,17 tooth clutch bell. The mg-66 can really get away from you quick if your not careful. I don't know if it's the engine or just me,but this thing is touchy. And by that I mean any little change and it throws the power delivery off. I put new clutch shoe's on with the 15 tooth bell,and it was like a sled for awhile. Then the shoe's must have seated and away it went!!! So I am eager to try at the track[tight technical] But will most likely go back to my original setup.