If you're only bashing it I would recommend a waterproof esc, not that you even expect to get it wet, but I've often found puddles that I didn't see when bashing.
The motor you should choose will depend on the type of driving you're doing. If you're trying to get really high speed on fairly flat, high grip terrain, then I'd go with a higher kV motor. If you're going to be bashing on rougher more technical terrain then I'd go with a lower kV motor.
Obviously you can adjust things with the pinion, but it is easier if you get it close to start with. The XR8 PRO is really nice to tune and I highly recommend it for track style driving, but I bash with my Castle MMX8S esc and 1520 motor in my
ET48 2.0 and it's the best basher vehicle by far I've ever used. The Castle system is really great and has so many tuning options, the fans don't like huge jumps, but not many esc fans do. The switch on the Castle is rubbish, but easy to remove. I've never had a hobbywing switch fail. The XR8 PRO is limited to 4s, but that is plenty unless you want to Truggify the buggy.
Here are some pictures of my
ET48 2.0 with a XR8 PLUS installed and my Castle system, I don't have any pictures of the XR8 PRO installed in my
EB48 2.0, but it fits beautifully.
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