The only issue with the Xtreme stock for off road is that the heat sink is a little on the small side. You would probably get away with an 8.5 or 7.5 at a push but I'd not go higher than that. The firmware would need changing to a MOD profile too but no probs there.
I've not personally tried an Xtreme stock in off-road so can't be 100% sure but I have run a 60A fine with a 6.5 so I know that works.
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