well, here is next day results on the givi windshield i installed yesterday. with a slight head wind top speed was 55-58and going the other way speed was 58-61. so it seems i lost a lot of top speed . tach was beteen 7000-7200.before big screen it was no problem to go 8000 rpm and 64-66. its very quiet behind screen and no wind on hands. but its way too high. i'll ride it this for a while and then cut it down, about 4 ins. at least .thats it for now,ike