I put the laminar lip on the second largest OEM V windscreen. The combination is 17" high, and was a great improvement in reducing turbulence. The L Lip did not fit flat against the OEM screen, since the OEM screen has assorted bends forming a wind tunnel up the shield. So, as an experiment, I covered the gap with duct tape. The result was an even smoother flow of air over the combination. I've ridden the combination up to 85 mph with no issues. All of this told me I needed a larger/taller windscreen, so I ordered the GT Touring screen from MikeShields. Should have it in a week or so.