Found this information on a Forza forum with the recent update to the PC version of Horizon 3.
356 A - '56
550 A Spyder - '56
911 GT2 - '12
911 GT3RS - '12
911 Turbo - '82
911 Turbo S - '14
918 Spyder - '14
944 Turbo - '89
959 - '87
996 GT3 - '04
Carrera GT - '03
Cayenne - '12
Cayman GTS - '15
Mecan Turbo - '15
[Mod Edit - Consistent with the Xbox Terms of Use, imagery of proprietary game code etc is not allowed on these forums. - MM]Besides the Porsches, also found were files for a Lola T70, a BMW 507, a Honda S800 and a Renault Alpine GTA LeMans.
Dear Mod, I did not post a picture of any type of game code, it was simply zip files in file explorer, showing the names of cars. That is not code, just a screenshot of the files in windows. If this post is any issue at all, please feel free to delete my post completely, I do not want to cause any issues.
Edited by user Monday, January 9, 2017 8:54:52 AM(UTC)
| Reason: Not specified