Well the XXX4 is great for smooth track, and the XX4 is better for rough tracks. The XX4 uses a one way pulley and the XXX4 uses a one-way diff.
I recommend the XX4 cause it is a easier car to drive.
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XTM Accelarator (GONE)
Losi MF2 (Sold)
Losi CR buggy
"Race it til it brakes  "
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