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You really really do not want to go too small, so it's better to err on the side of too large.
The size of wire you need depends on the current it needs to pass, and on the length of the wire run. More current, more length == larger. You also need a ground path that is as large/capable as the + wire.
If the stock wires are 8 ga., I'd use 4 ga if the run is about the same length. If it's longer, I'd go with 2 or even 0.
-soD
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