Basically any aftermarket pipe will improve the overall performance of the 200x. The stock head pipe was much skinnier, and the muffler made it really restrictive, and very quiet. You will definatly notice some changes in power delivery right off the bat. One thing to keep in mind is the jetting, as you may or may not have to go up a jet size. I piped my auto x with a bassani, and no jet changes were necessary, and noticable power was present. Another one got a super trapp, and that one needed some fine tuning to make it run smooth. If you remove the air box lid to give the intake a little better flow with the pipe, you will likely have to re-jet. Just put the pipe on, ride it for a couple minutes, and check the plug. Remember, it should be a light brown to run peak, black is rich (but probly ok) and you dont want to see white (lean condition, hurts motor) Good luck!
THE 80's RAGE! Currently owns:
81, 85 Yamaha Tri Moto 125
83 Yamaha Tri Moto 200 x2
82,83 Yamaha Tri Moto 175 project
85 Yamaha Tri Z 250
84 Kawasaki Tecate 250
84 Honda ATC 70
85 Honda ATC 350X
84 Honda ATC 250R
(2) 84 Honda ATC 200x
82, 83 Honda ATC 185s
81 ATC 200
Lots of other parts and bikes