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I drilled a hole through the firewall inside the car on the passenger side. From there I noticed there another firewall you must penetrate! I have a 4awg power wire going through there so it required me to purchase a 1/2" drill bit. I wasn't able to make use of a grommet due to the fact that the 2nd firewall is impossible to reach with fingers or hands.
Is is safe for me to keep it like that? I just installed an amp yesterday and its running quite well. I just think the only way it will get cut is if you intentionally saw into the wire using force.
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