Re: Parabellum windshield
I have a parabellum windshield. Mine is standard height. I would absolutely recommend a -2 or -3 cut on it. I am going to send mine in to be cut lower because even at the lowest position, I can't see over it. I'm 70 inches tall. Parabellum will cut it to whatever height you want. I really only use the bottom 1/4th of the adjustment due to its height.
My bike came with a vstream touring windshield and I found a 3 mpg increase in miles per gallon, and a drastic reduction in turbulence with the parabellum. The vstream caused a lot of wind noise to the sides of my helmet and shoulders, too. One place I really notice the difference is on the highway, passing trucks I don't get shoved around at all. The bike just cuts through and it makes for a much more comfortable ride at 70+ mph.