I thing you will be suprised, not sure if it will help to just cut it down. Mine has been removed since March and the only possible reason I can see for it is maybe in heavy rain. I think it may have improved fuel mileage as well but not sure because I don't think I've ever checked my mileage. We barely found time to attend Spydefest this year, work has been crazy and kids getting stationed back stateside has our calendar full.