This page is about hidden content found in a Gran Turismo game's resources. This includes unfinished versions of cars and tracks that made it into the final game, as well as hidden content which was scrapped but left in the game's files. We have collated as much information about it as can be found online. Please be advised that we do not recommend attempting to modify the game to be able to access it, as doing so can make the game unstable.

The Lancia STRATOS '73 and the Lancia STRATOS Rally Car '77 Later returned in Gran Turismo 4.

The Lamborghini NOMAD Diablo GT-1 (JGTC) '00 only appeared in NTSC-J version, and the car still remains in data of the NTSC-U version. But in the PAL version of the game, the body was replaced with a Daihatsu. Later, the car returned in Gran Turismo 5.

The Porsche 911 GT3 (996)'01 is a vehicle, and it was going to be the only one Porsche in the game, but Porsche's license was bought out by Electronic Arts for the Need for Speed series. Later, the car was cut from the Gran Turismo series and was replaced by the RUF RGT '00. Kazunori Yamauchi owns this car as his primary vehicle. Later, the car was now featured in Gran Turismo Sport.

There were also some more secret cars that were removed from the game. They were: