Exactly what I did. I should have mentioned it. Taking off the muffler allows you to get to the wires that run under a little tunnel. Like he said, it will make sense when yo see it.The wires for the taillight run between the plastic bodywork and the subframe for about 8 inches or so till they reach the connector. You'll see what I mean when you get it apart.
The easiest way to get the wires through there is to remove the right muffler, then take the plastic bodywork loose from the subframe. Sounds alot harder than it is.