DUDE! The SAME EXACT thing happened to me a few weeks ago. I noticed the muffler was hangin loose, then I just yanked it off of that same spot. Now I'm running no muffler as well, except my CA20E sounds exactly like the bosozoku 4 banger cars that you see on those youtube videos, I totally love it, and there's definitely a powerband shift, I should have ripped that P.O.S. off sooner. Funny stuff!