The functions of the Cooling Deflector Wings are: 1. Reduce the air coming over the top of the tank, around the sides of the tank, And between the upper & lower fairings. 2. This results in a reduction of air hitting the rider and passenger chest, which reduces buffeting/helmet & glasses bobble. 3. Redirect that air to flow over the engine for better cooling. We have consistently seen engine temperatures reduced by 8-15 degrees with the CDW's. These mount up easily at the front tank/frame mounting point on each side. They are adjustable to get the best redirection of air for you. When ordering, use the drop-down to let us know whether you have a Harley Trike or a Harley 2-Wheel Touring Model. This way we can send you the correct CDW for your Ride. Most baffles and deflectors that reduce rider and passenger buffeting also reduce air flow over the engine, making it run hotter. 2007-Up Twin Cams already run too hot during the warm weather months. With some thought, some curves and bends, & many miles of testing various prototypes, we developed the CDW's that - Reduce Buffeting Are unobtrusive when installed Increase air flow, cooling the engine, resulting in better engine performance & longer engine life This is an EASY install - 10 to 20 minutes! FITMENT: All Tri-Glides, Freewheelers and FLHXXX (with or without Tank Lift) All 1999*-Up 2-wheel Touring Models (with or without Tank Lift) Does NOT FIT the Heritage Softail. (yes, we know that HD has started listing the Heritage as a Touring bike, but it is a Softail and this is not designed for the Softail frame) ***Important Fitment Note for 2 Wheel Touring Models: -Fits 05-Up with Lower Fairings -Fits 99-up with NO Lower Fairings Patent D828,252