I just bought a 2005 FLHPI Police bike....shifting through the gears...when I reach 4th, it sounds like a blower on a Mopar engine...zzzzzzzzzzzzzzzzz....it's not real loud, but noticable compared to no sound in 1st,2nd,3rd, and 5th. it's got 6100 miles on it, and I absolutely love it. I purchased it from Mike's Famous Harley in Delaware. The bike was de-commissioned from the New Castle Police Dept. Does anyone have a clue on this one...?