I Presently am using a Motorvation "custom tune chip" in my 87 Mustang. But I will be replacing it with a SCT Eliminator. (the reason for the swap, I was told SCT was a better product than Motorvation, and I like the 3 stage tune) I am taking my Stang in next week for a Dyno tune. They say they can tune with the SCT chip but not the Motorvation. Is that possible? Or would the SCT have to be sent back to Bama for a new tune if the dyno shop can not do that. I also have considered purchacing a Tweecer or Moates Quarter Horse but I am not well versed in tuning myself. Would this be a better way to go? The man @ the Dyno shop told me that a problem with the Tweecer, it does not communicate well with newer laptops with Microsoft w/Vista, but does ok with the newer Windows 7, an older laptop would be needed without Vista. Unless the Tweecer has been improved to use with that program. Any input on that? So to put it into a nutshell, What is the best method for tuning my Mustang? I am basicly looking for the best A/F ratio and stable idle with my combo. And of course, the most power!