Thanks man.
That is part of the invasion stripe that goes on the the wing-to-fuselage fairing. In the 3-D model, oddly enough, as you rotate around the skin that section of the wing moves/wiggles and gives it a really strange effect. From some angles it is lined up like it should be but as you rotate the skin it moves out of alignment. It's hard to explain but if you download the skin offline (I think it is P51D_30) into the skin viewer via SAVE TEXTURES and mess with it you will see what I mean.
I'm open to any suggestions as to how to hide that better but I think it is just the way it was modeled. There isn't a true fairing there it is more of a 90 degree junction.