Yes, even 7S is really too much. Six S is plenty, if you can't go fast enough with that you need more motor, not more cells. I topped out at 89 mph no mater what I did in my 32" SAW cat, I needed more (longer) motor (1521 or 1527) to go faster. I was only a few mph slower running 4S and a 1521 in the same boat at the same event.
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