Time for everyone's favorite game. Just finished replacing the fenders on my 98 Sahara and just as I was about to toss the old ones, I noticed a black box attached to the right side fender that I failed to switch over or notice before. Box has no electrical connects going to or from, and only has one port on it, which looks to be a vacuum line of sorts, and doesn't appear to have any external screws to open it (though I haven't tried removing it from the fender yet). I can't find any loose connector in the engine bay, nor do I remember ever disconnecting it. Truck starts up and runs just fine without it as well. Any idea what it is? Thanks guys!