got a sound that comes somewhere in the exhasut. At certain low torquy rpms it sounds like a tin rattle. I just had Midas put on a new muffler, which I have had good success with as well as a lifetime garuntee, and when they were working I noticed that I had a pipe inside my exauhst pipe. I figured that that was what was making the noise so I had them tack the two together then put on the new muffler. So great not to have that sound anymore. I hate noises that I can't find or know what they are. The sound went away for two or three months and NOW ITS BACK! Any ideas on what this could be. Anyone experience this noise noise. I can't see any place where it is vibrating against anything.