Someone asked how you know if it's calibrated right. If it's wrong, you'll get a check engine light.
As for re-calibration if you change your intake or injectors at a later point... I was told by SPMotorsports that it is a $30 fee. From experience, expect a 1-1.5 week turnaround for recalibrations.
Two tips: Handle these things gently. And if you're using the original MAF screen, make sure the screen is really nice and flat and that you torque the four nuts evenly, not one at a time. Otherwise the rubber gasket gets pushed out the side sometimes.
