No reason to drill a hole in the firewall or anywhere else. Just find a rubber grommet that already has something else going through it and use a knife to make the hole a little wider or just use the existing hole. Dont drill anything.
The only reason you need to drill is to start a hole for your saw to go in, so any drill bit will work really. I suggest using a dremel to cut the holes...it makes life SO much easier and youc an pick up a dremel at walmart for 20 - 30 bucks.







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