The KFX 450r will make great power if you do the big 3. Make sure you do a pipe, INTAKE, and programmer. I thought at first I would just do the trinity power kit which comes with full pipe, programmer, and an aluminum adaptor to put in a bigger K&N filter. It made a little power but not much. When I did the new intake tube it made all the difference in the world. I personally used the Kids On Quads intake but as far as I know I got the last one and they are no longer making any more but it is great. I would still recommend Kids On Quads highly but I think they are now racing a Honda.