THE Racer
For those who still wonder if my "Perfect Return to Center" trick is useful... Probably the fastest Lego Car made of stock parts only, and I didn't use the RC Unit to control the two RC Buggy motors. Have a look at the rear and front axles, derived from the 42000 set: they're worth it.
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It works well with a box of rechargeable batteries (6 x 1.2V) or would you recommend another battery box with an additional s-brick?