Well I have been having problems with my 22mm nut working its way loose on my EGR and cant seem to get it tight enough to make it stay, and I REALLY dont want to put locktite or something on it. The problem is accessability, I just cant get to it well enough, even bought a set of wrenches like brake line wrenches (forgot the real name). SO my question is, does anyone know if the EGR and the pipe that leads to the exhaust manifold be installed as one piece? In other words removed, tightened properly, then installed together. If looks like it would be real close, would have to remove the bracket that bolts to the valve cover and holds a a/c line along the firewall. Which brings me to my next question, think removing one valve cover bolt, then reinstalling it would cause a leak? Anyone done it?