Are you looking to add an addition sub to the factory amp or add an amp and sub? I would be careful adding another sub to the factory amp. If you are wanting to add an amp and sub wired in after the factory sub, you will need either an amp that takes speaker level inputs or a line level converter. Either way, I would be careful. Factory systems can be very fragil sometimes.
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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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