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  1. Best hole through the firewall to rout wire for sub/amp?

    2010-2013 Mazda 3 & Skyactiv Audio & Electronics
    Just a quick question. I am trying to install a powered sub, and im searching for a hole through the firewall to rout the power wire through. Does anyone know the best pre-made hole that can be used? I heard the hood-release wire runs through the firewall as well. Where would that be? Im looking...
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