I have owned a 2005 350 since they came out, and I probably only have about 20 or so hours on it. I never really used it too much because I liked riding my MX a lot more, however I am getting older and after a pretty rough crash this weekend I am going to start riding the quad more frequently. I am a complete speed junkie and find the 350's performance and suspension to be lackluster in comparison to MX bikes. I have never drove another quad so I do not know if this is the norm. I love modding things and my ATV will be no different. Would I be better off dropping money into the machine or buy one of the 450 racing machines?