I'm hearing this crazy metal rattling sound coming from under my car. I have a 98 EX and a Greddy SP cat-back system. I checked down there and I don't see anything that could be causing the noise. I think I may have narrowed it down to be the middle part of the exhaust system (the sound suppressor or something, the thick part between the headers and muffler) - it seems to be coming from the inside of it, but I'm not sure. Any thoughts? Thanks guys!