Im running the 186 kit. The kit pulled awsome lots of tourqe. but i wanted more high end power. So i went with this head matched with a 34mm koso Throttle Body. Oh man this head made a world of differnce in the way the bike rides. It pulls so hard down low and dont stop pulling. 16/32 gearing i cruise 65 easy barely twisiting the throttle . And David was again the best help. Very responsive and helpful on all my questions. No top speed run yet . Still kinda breaking in the 186! 5*s again for DHM.