I apologize if this is a bit vague as I'm posting this while at work. I have been working on my 900 and am looking into possibly upgrading the intake at this point. I would like to either add a hyper charger or a cone filter intake. I am however worried about those messing with the amount of intake and fuel to air ratio. Not going for just looks. Any help is appreciated. I am still learning about the science behind the mechanics of it so bear with me.