I would suggust a product like the JL Cleansweep or RF 3Sixty. They will take the signal out of your factory head unit and do some much needed processing before finally sending out a clean low level signal (RCA's). You can then take that signal and put it into other processors (eq's, dsp's, xovers, etc) or on to amps. I have a feeling that a small 4-channel amp will make your stock speakers sound much better.
Good luck,
-JRW
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