The metal pipe which connects from the block right under the coolant bleeding valve, to underneath the base of the CAI. The hose underneath there is spraying coolant everywhere, so I need to remove the pipe to replace the hose, but can't figure out how the pipe is supposed to come out?? There doesn't seem to be any bolts or anything around it. Also, does anyone know the diameter of this hose off the top of their head? Is it 5/16th?

It's this one right here:

 

The pipe doesn't come off, not that I'm aware, just change the hose, burp the coolant after you're done.

 

How can I get the hose off without removing the pipe? That pipe runs entirely through that hose

 

Need to nip the clamp with grips and slide it clear <1 inch> and twist the rubber pipe to free it up and replace or clean it up.

 

I know how to get a rubber hose off... lol I don't think you guys are understanding. That metal pipe runs ALL THE WAY THROUGH that hose. I cannot replace that hose until the metal pipe itself comes off.

 

The pipe does not run all the way through, your hose is just stiff old and deteriorated. I've replaced that hose myself, I'm telling you from experience it does not run all the way through. The pipe ends where the crack is on the first pic.

 

This might help to clear things up for the OP
Replace part #10 and #11 https://www.hondapartsnow.com/parts-...ater-hose.html

 

OP doesn't have that fancy pipe 10 & 11 connect to because of his aftermarket intake. If he had the OEM intake, he'd have the OEM hoses and we wouldn't be having this discussion because the OEM hoses are 1000001010101048172384103874108347x better than the hose he has on there now.

I can tell because OP's hose has a pleated pattern and the OEM hoses do not.

 

Yeah I noticed the lower one was aftermarket but the upper looked kind of oem, you're probably right though.