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I use In Tune i2. Reason I use this is because it holds 5 licenses, can put ford or dodge on it as well. Also lots of custom tunes, although GM does a nice job of maxing the tune out of their engines. So GM vehicles get the least amount of benefit for GAs. Ford, different story. Bear is also a top tier system. Lots of Bully dogs, you can get custom tunes. I like mine as I said, I sell license's to friends and it has paid for the unit, they get a good deal, and I get my money back. Everyone wins.
