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You have a few choices
If you just want an amp and sub you can get a line output converter (LOC) and use the stock speaker wires to send the signal to the amp. Everything will work like it does stock, except you'll have a sub in addition to the stock system.
If you get a headunit things start getting more complicated. If you wire it up normally all the interior speakers will be double amped, the only way to effectively fix this is to rewire all the interior speakers (run your own speaker wire from behind the headunit to all 4 speakers). Then you just run rcas from the headunit preouts to the amp and that works fine.
Also, Sony sucks, as does just about everything else at Best Buy and Circuit City. Please stop looking there for your own good. If you give us a budget we can design something for you that will sound much better than Sony, Kenwood, RF, *insert other kiddy boomer brand here* for the price.
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