My dealer told me that when he talked with the factory folks in India, they told him that folks there buy a bike on how it sounds and will actually start up every bike in a shop to listen to each one of the bikes in the model line they may be looking at to see how they sound and goes with the one that sounds the best. Apparently the fins on the UCE model make a particular noise that folks were picking up on and wouldn't get the bike SO RE puts these things on and it eliminates that particular frequency range of vibration cause noise and sales increased... or at least that is how it was explained to me.
I took mine off. I'm with the more airflow crowd on this one. Being a guy who has driven air cooled vehicles since he first got his driver's license, I have been very familiar with the need to have unrestricted airflow over cooling surfaces.