I know they are working on it. I race with a guy who is testing it. The 4.5 is soon to be released. Just saw some info in the RC car action latest issue. I think the 5.5 would be enough for off-road. Anything lower then that would be too much. The 4.5 and 3.5 are for on-road. The 5.5 is not fast enough for most on-road.
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