In reply to:

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I usually take my empeg with me and fill the gaping hole with a bunch of wires trying to make it look like someone already stole my stereo. Photo: http://empeg.comms.net/files/124006-antitheft.jpg

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I like this idea, but I wouldn.t recommend the RCA cables, it only suggests that you've got amplifiers installed.
And a thief might think there would be something else of value in the car?
A simple audio setup in a car wouldn't have amps, just plain speaker wires hanging out of the sled.
That would give me a safer idea of leaving my car behind.
In fact, I'll consider fixing an equal wire-set for my car tomorrow (without the amp cables)