I experinced the same problem with the tube. I think the only way to remove it is to take something long and sharp, like a piece of re-bar with the end filed to a wedge, and puncture the baffle that the tube is welded to. Insert the puncturing device from the large end, and use a flashlight to note your progress as you knock out the final baffle. I tried everything short of this with no luck at all. Honestly, I think that leaving the tube and one baffle is a better idea, as it will create just enough back pressure, so that you won't lose any low-end power. The loudness increase is minimal when running the TOR's straight, as opposed to leaving the tube and rear baffle. Also, leaving the tube in will keep the Police nightstick test from getting you a ticket.
