I have the aluminum DrD exhaust and was wondering what I should use to repack it for the first time... the Moose Racing "pillow sleeve" packing, or the DRD "roll pillow" packing? I have used the Moose packing on my other bikes with different brand exhausts, and I know it works good. But is the DRD packing better for their exhaust? Also, I've put about 37 hours on my YZ since I installed the DrD. I recently noticed light grey marks going down the bottom of the muffler that looks like a stain from something, but I cant get it off. Could it be burn marks from the packing deteriorating? The decals on the muffler are fine though.