well i removed them yesterday and i also disconnected the servo motor and punched the cats. bike definatly has a different sound to it. its kinda funny though. it seems to bog a little in really low rpm but it lifts the front end easier. i haven't brought it up in the higher rpms to if it effected it or not but the throttle is definatly smoother. i just figured that they restricted the airflow going in to the motor. they were pretty easy to remove once the airbox was taken out. putting a power commander, pipes, k&n, and velocity stacks tommorow, and i think the combination of everything will be very positive.. will keep every one posted on the outcome.