I have a Vforce that I had bought for my 02 KX 250 still in the box.It was the same part number as the one for the 04 KX250.I installed it on my 04 but I didn't notice any real change.Bike starts and runs fine and the power seems to come on a bit sooner with less throttle but no real big change to speak of.I installed it only because I had already spent the money and I'm glad that the engine still maintains it's smooth power delivery but just seems like a waste of money on this bike at least.Has anyone else tried one with different results?