well actuly the only pipes with back pressure is disk type and stock pipes.
So you are telling me that the bend in your headpipe doesn't create backpressure, hmm...interesting, I must have been mislead all these years by my physics teacher...oh well, according to you he doesn't know squat anyway because he cares about spelling.
What constitutes a stupid idea? I would say something that will cause harm in one way or another, so maybe you just answered your own question...just a thought. If you know it is a stupid idea, why did you do it to your pocket bike? I'm really confused as to what is going through your head.