Other than cosmetic, any reason why you want to remove the closed fuel system vapor store charcoal evaporative control. It basically keeps the vapors stored until you first fire up engine, where the vapors get pulled into the intact tract rather than vented to open air and does not affect your fueling or available horse power in the slightest. Other thing, if you have state/local inspections, they will need to confirm the Evaporative Control System is working properly...just curious.
Pretty sure you want to leave one of the lines open as I believe it is the vent.