I recently bought a 96' kenetic moped and I am on a desperate quest for speed. It was in pretty bad condition after being left out in the weather for 4 years, but my dad (a highly experienced construction machinery mechanic among other things) was able to bring it back to life. I top out at about 30 mph (which is pretty good for a 50cc engine pulling a 200+ pound teenager) BUT I NEED TO BE FASTER!!! I took my exaust pipe off and reved the engine with the tire off the ground and it sounded ten times louder than a chainsaw, IT WAS SO NICE! But my dad immedeately told me to stop, because he could "smell" that it was running at impropper compression. I was alarmed to find that, in fact, there was a strange new smell coming from my Moped. Apparently these things need backpressure, but how much? I have the materials to make a straight pipe with no "honeycomb" like my stock muffler, but is that bad for my engine? Would it be better to just go and buy a high-performance exaust? Whats the easiest way to get better performance from your Moped (within reasonable cost) ? Thanks for any & all help.