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For just a head unit, there is no need to run any wires through the firewall. With the exception of the overhead microphone (the factory mic doesn't seem to play nice with anything other than the OEM HU) all of the power and speaker connections are present in the dash and usable by most any aftermarket HU. The easiest thing to do is buy from Crutchfield and pay the extra few dollars for them to supply a plug-and-play wiring harness. No cutting of factory wiring and you can return to stock in about 10 minutes if you want.
If you want to install an additional amp for a sub-woofer then you will likely need to run a cable to the battery.
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