I was wondering what everyone thought about the power upgrade you get from a curtis sparks pipe, jet kit and k&n filter. It is for a 2004 400ex, all stock. We had it out at dumont last weekend and this thing is weak, would not pull all the dunes even in 2nd. Would just the pipe,jet kit, and k&n be a very big difference? I dont want to spend a lot because the wife rides it, but have got to do something. Also how does anyone like the hot cams stage one? are they any good? thanks for any help.also i ran 4psi in the paddles , is that about right
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