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I believe with Cobb you could return to regular settings. I think JQueen was selling his.
YES, w/Cobb AP you can go back to original settings w/o problems. I have done it twice, have car serviced under warranty and then re-installed the custom tune map. But hey take in consideration as of now, get more HP out of ur G's is not an easy task for any pro tunner by just reflasing. Search this forum an you will see. In may case only 10HP were gained after various attempts with different maps resulting some of them in total fail when dynoed then back and forth the tunner gets +10hp at 7000rpms. Only 5hp at midrange were they are needed the most. Good look.