On the US TMax site one of the members stated that if he pushed his knees straight out he noticed that the air turbulence sound around his head dropped quite considerably ...
I was riding a long going to a job and I thought what the heck I would try it... "bloody heck it works" I have the laminar lip but the drop in noise was still noticeable..
I tried it at different speed with the same results.. I know I looked a goose riding like that but .. maybe winglets like the ones that Yamaha sells for its 08 TMax.. I just can't work out why as yet.. but it does work....