Yesterday the UPS truck brought me my SCT tuner from JMS chip as I was leaving for the drag strip. I wasn't going to load anything into my car at the strip because I wasn't familiar with the tuner and I didn't want to mess anything up. I get to the strip and there is a guy there that says he knows how to do it and its really easy. So I say ok that would be cool b/c I would like to see my times with my tuner. This kid has a 04 GT. Mine is a 00 GT. Anyways, I was supposed to have two tunes loaded on there for my car from JMS, an 87 octane tune and a 93 octane tune for my mods. This dude goes into change paramaters and says that I should change a few things because it looked like they hadn't changed anything. He does a few little changes nothing major and loads the tune. My question is: Did this dude just erase my tunes from JMS by changing a few of the "parameters"? The tunes were labeled 'safe', 'mid power', and 'max power'. I'm not sure if this is the generic label for all SCTs or what. If he did change the tunes what should i do?