If you own one of these then you might have noticed a lack of power compared to the zforce, especially on hot days. The rubber "ducting" from the intake box and the air cleaner housing is not rigid and tends to choke off under vacuum, such as under wider throttle settings. I tried to do several things with it without much success. In the video I am linking here I show what I did to improve the situation. It may not be the best idea, but you can't argue with results. I now have every bit of power that my zforce 800's had and it's great. I will say that If I could do it over, I would have made a single pipe riser like I did with my trail 800. Comments and observations are welcome.

https://youtu.be/jZgES_b4LKg