Good possibility that it's just throttle body noise. Throttle body will make noise that kind of sounds like a bad lifter. Doing engine upgrades and air filter upgrades will allow more noise to come out of the throttle body and it is nothing to worry about.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.