Running another head unit while keeping the factory speakers will work. You are effectively cutting the impedance in half. This is a common practice in car audio and you essentially double your power. If the new head unit or separate amp can handle the reduced impedance, you will be fine. You may find that the new head unit or separate amp will run hotter though.
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I don't care about the "Jeep thing"  as long as my mail is on time!!!
Slate Blue H3 Adventure w/sunroof, Monsoon/NAV, DVD and marker lights
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