This is just an FYI post. I live in denver where the air is thinner. I did the partial bafflectomy and drilled 10 1/4 in holes in each muffler. It sounded a little better than stock but on decel, every time I would get a loud gunshot sound accomanied by a little fire. I decided to finish what i started and removed the baffles completely. The sound is amazing and no more gunshot sound. I think the bike was running rich and opening the pipes up all the way leaned it out just enough. So if you are like me and live up high, just take the baffles all the way out.