I know there is a thread on how to remove the rear seats to get to the factory sub, but does anyone know another way without having to remove the seats? I dont really need to remove the sub, just a way to remove the harness so I can tap into it to connect it to a line-out converter.

 

Yes there is a way to connect a Line-Out without tapping it directly from the sub. Simply locate the OEM AMP and tape the wires from there, however, if you do plan to disconnect the SUB, you will need to remove the seats, C pillar covers, and rear dash.