Some of you mentioned wishing something like this was available, well here it is. I imagine you were wishing it was available at a reasonable price, well, here it is not...
MRA X-creen Add-On Variable Windscreen Spoiler Blade (bolt-on) - MRA.XCA : TwistedThrottle.com
Personally, I am not a fan of the concept. Going back to pesky old fluid dynamics, anything that could throw air over your head like these are claimed to would also create enough vacuum behind it to suck your teeth out through your faceshield. Sorry, I am prone to hyperbole, but you get the picture. Maybe if incorporated with a CalSci vent, I don't know.
MRA X-creen Add-On Variable Windscreen Spoiler Blade (bolt-on) - MRA.XCA : TwistedThrottle.com
Personally, I am not a fan of the concept. Going back to pesky old fluid dynamics, anything that could throw air over your head like these are claimed to would also create enough vacuum behind it to suck your teeth out through your faceshield. Sorry, I am prone to hyperbole, but you get the picture. Maybe if incorporated with a CalSci vent, I don't know.