Carl is right on -- all X - 6s, original or Squared, wallow like a pig with a stick pack across the back. There was a thread on here a while ago about it, so I don't want to repeat everything, but the upshot is that you can install a 4+2 pack anywhere a stick pack goes and it's no real work to make the pack -- take out a bar and replace with a wire.
The whole concept of the X - 6 is about weight distribution, and when you throw it severely off with a stick pack across the back, you give up the advantage of the car. Why do we run LiPo across the back? Because a LiPo stick very closely approximates 4 cells.
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