Awsome product, installed on my 05 crf250 to get rid of the low end bog. not only does it solve the bog issue it starts much easier, and the throttle response is amazing. I dont think it gave the bike any more power it just made what it already had much smoother and easier to accelerate out of corners. Dont try and tune your carb to get rid of the bog, GO BUY THE QS3. Every bike is different so your qs3 might need to be adjusted a little different than the instructions recomend but they will get you very close to perfect.