Money spent on mid frame air deflectors would be better spent on an after market tuner instead. Upon riding my Dyna, I immediately noticed the heat coming off the engine, and I installed the Harley mid frame deflectors. They do work to keep it cooler, somewhat. However, I also used a Vance & Hines FP3 to tune the map, and the heat dropped even more. Now, with my street glide I just used the FP3, and I have no issues with heat. Mid frame air deflectors treat the symptoms, a better tune treats the disease- these bikes come from the factory horribly tuned to meet the clean air standards.