One consideration... changing the profile of the windscreen for looks is a personal choice, of course, but if you're looking for better performance by lowering wind resistance with a smaller screen, I'm not sure it'll help all that much, since you can't get yourself out of the windstream without assuming a very uncomfortable position for a Burgy. As long as you block air, performance won't really change. It may, in fact, worsen, as the air stream will no longer be smooth from the shape of the screen. (I'm doing a lot of reading into motorcycle design right now. The way to tell is take a photo of the bike from the same position with both screens, and overlay graph paper. The number of full and partial squares taken up by each configuration will determine if your wind profile will improve with a modification. Of course, that would mean having the S screen already, but some visualization will give the same idea without spending any money). Just a thought.
Then I don't think it'll help, personally. You make a bigger barn door than the stock screen, and you aren't nearly as aerodynamic. Get on your bike on the centerstand in full gear, and have someone take a picture of you head on. Look at how much of you sticks out beyond the stock screen, and consider that you will be in the same position no matter what screen you have. Your profile will not change beyond the amount of space you occupy, and aerodynamics will be better on a smooth surface rather than the uneven surface of your riding gear / arms/ head. In addition, uneven aerodynamics will affect the way air moves around the bike, which is more likely to create low pressure spots behind your body which will make your ride much less comfortable, and actually reduce your gas mileage.
It is the marines, by the way... the quote I'm referring to is out of "Full-Metal Jacket" in which they are reciting the rifleman's creed before bed, holding their rifles at attention while lying on their bunks.
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