I got caught in the rain on mine, With the duck bill thing on. I did get some spray up on the passenger seat, and on top of the duck bill. I actually like the look better with it, as it hides wiring and my signals (my signals are mounted to plates I made up that mount to the old exhaust hanger donut things. If you do a different kind of signal setup and run wires differently, it would look better with the duck bill off. The difference it makes is minimal in the rain, so it is more of an aesthetics thing really.