You, sir, have talent. Do something with it.
God DAMN you are good at that. Way better than any of the wannabes I know. Not to say that I can beatbox, but I can recognize talent when I see it.
I'd much rather see you put this stuff into a song, or something a little bit more coordinated than this. It'd be easier to listen to, for sure. Set yourself up a nice background beat...or melody, actually, considering the fact that you can be the precussion. Then have at it. My favorite part of this piece was when you lapsed into your own remixed rap, around 3:01.