I can't speak for this community, but if your bike runs well the way it is and you're not trying to get more performance out of it (with all the changes and tinkering that entails, and understanding that drilling holes into your muffler isn't going to do anything to boost performance), I'd leave the damn thing alone. From your initial question and answer to my question alone, I'm guessing you don't have a lot of experience in modifying for performance. Seriously, leave the damn thing alone, especially if your exhaust is in good shape.