I wouldnt even bother with line inverters or high level inputs, they usually sound like crap, first thing you need is a new head unit. CD player units are getting cheap these days you can get a decent one for 100 bucks. But that way you can run some RCA cables and an amp turn on wire back to the amp. The factory speakers you could probably get away with keepin if you just want a little extra knock. Just get a head unit with subwoofer volume control and turn the bass all the way down on your head unit and turn the subwoofer volume up. I did it that way for a while before I replaced my factory speakers.
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