Dog brings up a good point about having sufficient charging capacity with an UDP. My lightweight under-drive pulley set spins everything slower by 20%. This means the amps my alternator can deliver at lower speeds is reduced.
Here are some voltage measurements taken by someone that had installed an UDP on a TSX:
And the weight savings:
Looking at this image got me to wondering if adding "moon" covers or just taping over the holes in the pulley could significantly reduce the drag caused by constantly chopping at the air? These items are constantly spinning, even when stopped.
