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My bike's and my truck's factory ecus have been replaced with megasquirt stand alone ecus a while ago, it gives you control over anything you could imagine if you know what's going on. If you don't, it's very easy to make the engine run poorly and damage it especially if it has some kind of forced induction. If I was going to produce and warranty and engine I wouldn't be ok with others to modify engines tune just by anybody. I go to a local track, and majority of racers there don't know what's going on or have any clue, they modify engines internally and then upload useless maps that most of the time make the bike run worse. For some reason they pay big money to build their engines, but end up skipping on the ecu adjustment or do it themselves.
From my experience factory ecu's are very good, they provide very good cold start, part throttle, good power and good mpg for just about anybody and provide a pretty good safety margin. Very few could benefit with modifying it, most wouldn't.
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