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I think you'll have a different setup if you don't have the JBL system. One of the components I used (TATO) is entirely unnecessary if you don't...
I didn't have a backup camera and didn't add one. The post I linked at the beginning has a walk-through of how to do it, though. He talked about...
Added some pics and some more info
I replaced my HU with a Pioneer AppRadio4 leaving stock JBL amp in place. Prior to ordering I warmed up to the idea after seeing how easy it was...