I can give you a couple reasons to do the relay mod to your car.Even if you use the stock motor and drive around for fun in the kitchen.
#1 you get more power to motor and the car is faster.
#2 The steering on your car will react faster and stronger because the relay is by passing the circuit board when giving power to the motor.
#3 you don't get a loss of power when you make turns.
#4 your car will run better over all
That's what it is all about.
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Slot Surfer VULCAN RING SLOTCAR RACING I get my news from the daily show with John Stewart the #1 fake news man in the USA