[Kirk]

I've heard of something along these lines. The idea is to stick a drill bit as far inside the muffler inlet opening and drill some holes through the pipe INSIDE the muffler. If you look at a cross sectional picture of the muffler you'll see that there are a couple resonance chambers the exhaust has to travel through. By drilling holes inside the inlet pipe you allow some exhaust gas to bypass one of the resonance chambers inside the muffler and thus increase the noise level. This is just something I read about, I have no first hand experience hearing the results of this mod so I make no claim as to how well it works...