Per the suggestion on the first page, I just zip tied the hose closed as shown in the pictures. Very easy to do and no vacuum leaks. It was interesting to start it up with the hose pinched and then let it go to hear the difference in sound. Quite a change.

Also, if I didn't know any better, the engine feels a bit stronger. It's probably all in my head, but without a dynamometer to prove me wrong, maybe - just maybe - it is...