Just a suggestion, I would use a freeze plug, I would not cut the tube. The reason is its hard to go back if you cut the tube.
When I retrofitted the later air box to our 95 Suburban, I cut the end off the tube and used it to plug the hole. The new tube-less air box was noticeably louder than the old air box. Loud enough that I got complaints from the wife and at the time, it was her daily driver. I tried to find a used tube, but no luck. So I popped down to the local dealer and found that the tube is only sold as an assembly with the rubber bellows and at the time was like $85, probably over $100 now. I did eventually find a used tube and as soon as I installed it, the noise went away. It really made a huge difference. I did have to fab a bracket, but no big deal. If you have a complete tube, you can reinstall if you so desire. A cut tube will not do you much good.