5.5 was enough for me, with the sintered rotor it was too much. The 4.5 with sintered would be even more than too much. (this is in my 501X)
on dirt I ran it with the 3* and 6.5 bonded motors.
There might not appear to be much difference in the power levels but it does make a difference. Have a read of my review of the 2007 system on here. Most places I use power setting 2 - 1 in the wet unless I need to clear a jump. My throttle finger isn't the best though so I need all the help I can get.
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