i have a question,,i did a search here first .but did not find much info on this,,i called a place today and they have program called sct xcalibrator,,i guess its new ,they said they could tune the car with out adding a chip ,by programing the factory computer,and i can retain the factory code and change it back if need be,,i also can program up to 3 different tunestotal ,,i am installing a 3.01 pully and cat back ,and having them tune it on the dyno,,just courious if any one else has used this type of tune or that product thanks 
