So I receive my GT500 Certificate anticipating the normal production breakdown stats. The only info,my certificate contained was that my Shelby is a certified pre production vehicle with a build date of 4-4-2012, approximately 1 month before regular production was initiated. The additional sheet enclosed with all 2013 GT500 build stats states 92 pre production vehicles were included in the figures. I purchased my Shelby on 3-20-2013 with 1360 miles on the clock. The window sticker originally stated "Vehicle Not For Sale". I have had no issues with this car. It was virtually brand new to me. I'm trying to find out more about the history of these pre production vehicles. Ford Performance will only give me the build date. From info I have obtained from Ford employees close to 2013 Pre Job 1 vehicles the majority of these vehicles are crushed and never offered for sale. No one has given me any solid answers so far. Mysterious.