The stock ECM can be reflash for performance mods without having a tuner, the reflash of the ECM map will allow the ECM to adjust AFR and timing to compensate for performance mods.
The reflash will get the bike to where it will run half way decent. To get the bike to run the best it can then a tuner is needed such as the HD SERT or a aftermarket tuner, using a tuner will allow the dyno tech to fine tune the AFR and timing and get the bike to run the best it can.
In other words The stock ECM can be remapped and a ECM tuner is needed to do a dyno tune. Your friend didn't get ripped off and if you do performance mods to your bike you should consider doing the same thing.
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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.