whistle problem

[hamman]

I switched from a 99 tourer to a 01 Interstate this spring and finally have got it on the road after carb work and weather delays.Very impressed with the performance,ride and handling but it has a whistle that I am having trouble finding.It seems to be louder on my left side and varies with wind speed,direction,wind gusts and road speed(I guess that would also be wind speed).Before I go nuts does anyone have any suggestions or may have run into this before.TIA Hamman