if you run a givi 405 and vario wing
then you may want to try this. mount the wing on the inside of the shield. I found it really smooths air flow, and it looks cool, to boot. If you leave it in the highest position, you won't have to do any mods to your windscreen. I tried this after mounting up a wing that's 5" taller than the vta4 to see if it helped with noise at 75+. it didn't. I got better results just mounting the vta4 on the inside of the screen. My windscreen brackets are .5" shorter and 5deg sweptback, so YMMV.