want to install power wire through firewall of 2013 300c 3.6
I’m not sure that’s a question but, there are usually rubber grommets in the firewall that you could sneak the wire through.
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Lots of firewall grommets out there to choose from… Pick the best one for your application…
Be carful, lots of wiring harnesses and other things that you can damage while drilling through the firewall…
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Suggest to ask a qualified shop do this job for you. Power supply wires must be designed to be correctly sized, fused, & routed; otherwise, a car fire is possible.