If the bike runs good and you are happy then just stick with the download. If you are having tuning issues then use the tuner. In most cases a tuner will help the bike run better and cooler so it would be good to have the bike dyno tuned using a tuner.
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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.