First off, don't pay anywhere near that much for your XFI if you do it. Call us first.
Second, the factory ECM is pretty damn smart with the right tuner on it. The GMPP unit can have a VIN flashed into it and is tunable but you will want to hire a pro to do the tuning. However, if you want to play tuner yourself, you might as well go XFI or Accel Thruster. While one could buy a HP tuner and tune a factory ECM, it is really not very NEW USER freindly.
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Frank Serafine
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