Tuners and Dealer reprogramming will do the same thing. Except... the dealer is bound by EPA laws that will keep them from doing what you really want. A tuner is not bound by EPA laws, except maybe in California.
What you are doing with the mods is changing the way air/fuel flow into and out of the cylinders. If you do not adjust the amount of gas going in with it, you will not be running very efficiently. The tuner will adjust the amount of fuel to get you to the optimum fuel air ratio. A dealer tune, if they stick to the law, will probably run leaner because that is what it takes for EPA compliance. A basic tuner (no Auto) should be accompanied by a dyno tune, where they will adjust what the tuner does to optimize it to your exact bike. With an Auto Tuner (I have one), you get broadband 02 sensors that give the tuner more data than the stock sensors, and allow it to make the adjustments as you ride. If the tuner senses you are running lean/rich, it will change the amount of fuel being injected. All you have to do is the initial program that gets it close, the Auto Tune does the rest.
Bottom line, IMHO, get a tuner.
In theory, Theory and Reality are the same. In reality, they are different.
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