I have an 05 Taurus with the Duratec 3.0 ans it has 57000 miles, it sounds like the rear exhaust manifold has a leak. I hear it when it first starts up and as it warms the noise goes away. I think you all know that there is no room to feel for the leak. I am hoping that it is a pipe or hose that fell off because this part would be a b-=#h to change. Any Ideas? Thanks.