The stock windscreen creates turbulence for some riders and as well, some riders would rather take the wind straight on, rather than install a larger windshield. Removing the shield completely isn't the answer either because it leaves the instruments unprotected and besides, completely unmanaged air flow gets tiring after a while, especially at high speeds.
The Wunderlich FlowJet is a beautifully made piece that addresses all of these issues. It looks great and it works extremely well thanks in part to the fact that the angle can be adjusted to suit the rider's individual preference.
The FlowJet is made of black ABS plastic. Installation is easy and no permanent modifications of any kind are required.