I've seen a few used Shelby GT's out there and was wondering. If I purchased one used could I send it to SAI to be modified or will they only modify new ones. Basically I wanted them to add the SC and a few other bits.

 

All the mods like superchargers can only be done on cars that are titled anyway (after the new car purchase), so having them mod a used one should be rountine business for SAI.