hey i just posted this on the big long thread. but this might be better. i have a hyper 8 with a mach 28. i raced a tmaxx 3.3 and he past me on top end
do they make a 2 speed setup for this. if not whats my option for maxima top end.

larger clutch bell. Go up about 2 teeth or so on size of the clutch bell it will give you more top end.

the one for the hyper 7 might work

It will work