The attachement that replaces a straight tube spins the incoming air and uses centrifugal force to "spin" the dirt out of the air before it reaches the air filter. It also cerates an area of low pressure that accelerates the air into the intake. This will not work on a CAI but will work with a Safari Snorkle . I have 1 on order and should have it within a month. I'll give a update when i get it on.