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Never ever use a low C rating to reduce performance, use a slow motor, steady thumb or radio/ESC limitation.
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Truer words were never spoken. Doing this can be very dangerous, and at the least could ruin your LiPo pack.
The C rating of a pack is just referring to the amount of current that pack can safely discharge whilst keeping good voltage, so the higher, the better (though there are always some manufacturers who over-rate their packs). You'd want at least a 20C-rated pack if you're going with 3200mah capacity, but preferably higher.
If you're running a hot motor (like a 3.5T, for example), then a pack of the same capacity with a higher C-rating will often provide more "punch". This is just because the higher-rated pack isn't having to work as hard to produce the required current, and as a result can sustain higher voltage...though this isn't really noticeable on slower motors like a 5.5T or above as neither pack will be struggling.
A pack with a higher capacity but same C-rating will have the same effect. Also, having a pack with a higher C rating than the bare minimum will allow it to run under less strain, and ultimately have a longer life.
Remember that C-ratings are relative to the pack's capacity, so a 20C-rated 6000mah pack would be able to safely supply more current, if required, than a 30C 3200mah pack.
Don't go by C ratings alone, though; one manufacturer's 30C-constant rated pack might perform way better than another manufacturer's. Sorry, I'm writing you an essay here. What motor will you be running?