One problem related to manifold/header/muffler/tail pipe has been reported for the 2007 Mercedes Benz ML63. The most recently reported issues are listed below.
I was driving to work and my vehicle started to sputter. I moved into the turn lane and the car would not start. I call the tow company and had my vehicle towed to the shop I had requested. When the shop pulled the codes they told me that my intake manifold and it would need to be replaced. I called my extended warranty company (cornerstone auto) which is the biggest rip off company. They would not cover it because it was not listed and is not a part of the lubricated engine.