running the power wire through the firewall is always the hard part of an install. well, for me anyways. if you are daring you can drill your own hole in a portion of the firewall that is unobstructed by anything in the way and use a rubber gromment so the sharp edges wont tear any portion of the powerwire. also use some silicone sealent around the gromment. once you get going with your project it will be easier then you think.

here is where i have both my amps installed
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"STOP or I'LL RELEASE MY DOG!"