Should be because of Voltage pikes in the Output through the higher frequencies. Therefore a higher Voltage capacitor works better. Itīs hard to describe it in english for me. Its daily work for me but not in english ^^
Itīs easier to flaten the voltage with high voltage capacitors if you have high frequencies. Iīm definitly not sure if they use it because of that but its apossibility. If you can see a realisitc change in the working of the car? I donīt think so...
Hope that helps...
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