Hoping someone on here has had success removing the air tube that runs into the cat. My question is how were you able to access the bolt holding the tube in place located behind the manifold? I've run out of ideas and can't fit a wrench or socket in the tight space. Any and all help would be greatly appreciated.

Yes I've done a search but nothing found on my specific question.

You mean the bolt on the back of the head? I never had a problem breaking it loose with a box end wrench.

Ya. It's in such a tight spot it's hard to get anything in there.