Charge pipe - Not covered by CPO warranty?

I have an '09 335i and my factory charge pipe broke in two. When taken to the dealer, they denied that the part is covered with my CPO warranty, which states that engine parts are indeed covered.



Not only would this cost an unnecessary amount of money, but I also can't run an aftermarket and superior pipe because it could potentially void my warranty in the future.



Does anyone else see this as a legitimate and unfair concern or is it possible that the charge pipe somehow falls into the "upkeep" category.