i run a 10.5 in my x2c indoors and have done also outdoors, turbo is the answer (ran 10.5 at the TC nationals), at tichfield with a 10.5 i ran a 23t pinion and 15deg of timing on the motor and 30deg of turbo, fast as you would want it, there is more mechanical drag with 4wd but should be ok.
what motor and speedo ?
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