[5.0 Pony]

Hey , i am going to do a custom exhaust, ill be doing all the piping and such myself. I noticed that there is a tube welded in my h-pipe that runs up into my engine compartment, what do i do with this? do i cut the hose there and plug it where the hose connects? It looks like it could be the thermactor pump?? What do i do about this? Can i take off just the piping and plug where that pump goes or what? PLEASE HELP ASAP! THANKS!