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Run the power down the drivers side, don't worry about the fuel lines.

Run the RCA's down the passenger side.

It doesn't matter where you run the speaker wires.

Tip: Keep the ground wire from the amp less than 18" long to reduce the chance of electrical noise.

:D
 

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Only the power wire will introduce "noise" into your RCA cables, and then only if you run them parallel - next to each other.

Speaker wires carry a much higher voltage signal, which tends to be impervious to low-level noise that alternators and such make, and hence will not affect the low-level signal of your shielded RCA cables. You can run them anywhere you want. Next to the RCA's is fine, next to the power is fine. They are not affected by much of anything, hence why speaker wires are never shielded.

I would personally run a speaker wire down each side since you're gonna have everything taken apart anyway - it's just easier than running one behind the dash or pulling your center console out, and there is no reason to do either of those options.
 

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No worries.

Again, the ground wire should be 18" or shorter. The shorter, the better. My setup uses one of the seat belt bolts for the rear seat, but my amp is right there. Basically, either find a nice, close bolt, asnd the paint/bolt/whatever or drill a hole (not into the gas tank!!!), sand the paint, screw it down.
 
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