I believe it is autographed by Camilo Pardo the lead designer of the 2005 Ford GT. Like all of our signatures it is slightly different each time but clearly fits his unique style.
Upper and lower braces with 20 inch factory wheels
Even if your GT was not a PP the upper and lower K braces were installed if the factory 20 inch wheels were specified.
The following is from a Torsen/Ford press release:
With the introduction of the updated Mustang from for 2018, Ford has elected to spread out the availablility of the Torsen differential a bit. It was once limited to manual transmission cars only. For 2018, however, the GT Performance Package...