I'm here because air was going the wrong way out of my intake... not good (thump-thump-thump noise). It's an '06 TDI with about 180K miles. I removed my valve cover tonight and found at least two worn lobe edges, some cupping on the lifters, and a gauge out of another lobe. We've had some power loss, not terribly noticeable though. So, I'm particularly interested in the camshaft replacement procedures at the moment... thanks in advance for all your collective wisdom!