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You don't mention which car you have... I have a s13, and it was easiest for me to go through the firewall next to an existing wire (and existing grommet). straight back from where the battery sits. My car had lots of grommeted holes to choose from, I saw no need to drill, but if you do, be sure you use a grommet, and make as small of a hole as you can get away with.
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