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sounds like an automatic pressure relief switch for head pressure...maybe not, my UC does the same thing and for sure sounds like pressure being released.
I got an 06 with SE air cleaner and it does the same thing. More of a whistle. Not every time. Never thought anything of it. If I worried about every sound that comes from a Harley I would kill myself! [sm=alcoholic.gif]
My RKC does it too.... A low whistle right about the time the engine comes to a stop...not every time...I'd guess about every 3rd or 4th timeI shut it down....Is this happing on fuelinjected bikes only??? Maybe fuel pressure bleeding off???