well the heat is a factor but i suspect it's mainly due to the amperage a larger motor consumes, a 255 for instance can draw 2-3 times the amperage the stock pump does, that is why it should be rewired with its own relay and larger guage wiring, 15-18 amps constant is quite a lot of power, then start talking about running two of them and you are looking at over 25 more amps of constant draw the car now has to put up with and this isn't a sound system, we are talking all the time constant draw. My old suzuki swift had a 40amp alternator, it would barely be able to keep up with just those pumps.
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