This is a kind of "rattling" noise that is coming from under the car, between the flywheel and tranny area. This noise has been there for over 4 yrs. and it never gets any worse. 2 yrs. ago , I seperated the engine from the tranny at the flywheel , started the car and the noise was still there. It doesnt have the noise at all whenever you first start it up, just after it gets warm. I have done the stethoscope thing all over that engine and tranny.It just sounds like a heat shield "rattle" but its not.I am open for ANY suggestions that might be out there. The car runs like a beast and is in excellant shape.Sooooo! Get those thinking caps on please. Thanks Everyone.