I have an 2007 400ex. It goes about 65mph in stock trim. My bike has an exaust and a k&n air filter. thats it for motor parts. If you want to keep up with a 450 buy one. On the trails i keep up with my buddies pretty good but in a race they kick me around a little. but i like my quad and would recommend one to anyone. but it will never be as fast as a 450 and if you get close all they have to do is modify and they can do more because you start of with more displacement.
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