-In you are not keeping the CD changer you must use a fiber optic loop to bypass it.
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If your car has a CD changer and you do not want to do the extra work to keep it you will need this loop to bypass the CD changer or it will conflict with the Dension unit. Optionally if you are not interested in the AUX or USB up front you can leave the Dension unit in the trunk and a bypass is not needed.
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This part is the easiest way to tap into your factory power wires for power. You will need one for each wire and we recommend getting an extra one just in case you drop one where you cant reach.
These are the Panel Pry Tools that we use in our videos.