2k1 XJ limited with some sweet (what I think is) exhaust noise. Sounds like a constant droan coming from right around where the muffler is whenever i've got my foot on the skinny. When it's off - no noise. So I looked at the muffler today and didn't notice anything major but i did notice a small (1-2mm) hole in the front of the muffler. It looked so perfectly round that it almost looks as if it should have been there. Any insight into my problem would be appreciated.