I would think the motors should handle an increase of 300rpm and that would keep the revs up between shifts. My ride seems to get quicker the faster it goes, like 3rd gear and 4th are better than 1st and 2nd, opposite than I would expect. My cobra was useless in the first 2 gears with a 6-speed Magnum tranny. Well, anyone shifting at higher rpm's and if so who did the tune and at what rpm's are you at? Thanks, Mark