A Plug for Don at F4 Customs:
I ordered and installed the F4 11"clear vented last week.
I am 5'7" and it is almost perfect. Before the stock windshield created so much turbulence on top of my helmet I thought I would go deaf when I am perched on the OEM seat.
I also do NOT like looking through a windshield. Now I have no buffeting and it is much quieter (still some noise).
When I install my Mustang seat and drop down another 1" into the cockpit I suspect all the noise will disappear.
Great Product.