Just to resurrect this a little...I seem to remember reading somewhere on this or the 675 forum a comment that a radiator guard (or certain model of guard..?) "really enhanced the intake growl". Implying that the comment was about a model that affected the intake in some way? Don't see how, but can any of the experts comment? If not the rad guard, what could modify the intake sound? I love the sound of the intake and to make it even more "growly" would be something I'd be interested in!!!