I agree with FLRoadking. I took them out for a couple of weeks, but put them back in. While not having them installed may help a bit stoplight to stoplight, I think they slow down the flow-thru effect at highway speed. As reported, you sure can feel the additional heat on your upper thighs. I'm thinkin this mod may be more effective for cool/cold weather riding. I'm going to give it a try next Fall/Winter.....