I used one. Used is the word. It ended up being too restrictive and I was constantly running rich no matter what I tried. When you run rich and have 110 mains, not enough air flow. My filter also constantly smelled like gas. Took filter out And bike ran awesome
So I ditched the emgo and since the honda filter was so expensive, I spent about 20 more and got the k&n and the recharge kit for it.
I will say the emgo is constructed very well though. It is not cheaply build.