Don't know about the mail in flash, but the dyno tune will allow the tuner to see exactly what your car is doing, and how to tweak it. My throttle response is definately smoother, I'm not running rich anymore, and I picked up some good power. My tuner also threw in a cypher cable so that I can data log. Should I choose to do more mods, he can tweak it again without the use of the dyno.
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