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Yup. Capacitors are essentially high-pass filters that allow high-frequency noise to short through them (to ground in this case) and out of the car's electrical system. Remove them and you'll probably get some nasty glitching or other bad reactions.
Capacitors do not add power, but they do store charge and can release it when the main power supply voltage drops (the batteries). In this manner they help smooth the voltage signal.
FETS, BJTs, and other types of transistors can be used as amplifiers to effectively "boost" the power fed to the motor.
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pbmax
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