Just introducing myself , my name is Rob and I just purchased a used 2008 Jeep Grand Cherokee limited . W/ hemi . Stumbled upon this website searching for exhaust leaks on Hemi . I did find a broken bolt on driver side exhaust manifold, was able to get it out with pb blast and get a new one in . But I still have the noise . Going to bring it to mechanic tomorrow as its just too cold here in New York to work on the jeep in the yard .