I would love to see some footage of the Hi-fi Mode.
Who dares to take the challenge? https://gran-turismo.fandom.com/wiki/GT_HiFi
GT HiFi (short for Gran Turismo High Fidelity) is a special game mode that appeared only in the original Gran Turismo. This special game mode allows the player to race in a two-lap time trial with the game running at 60 FPS, hence the "HiFi" in its name. In order to run the game at 60 FPS, the courses contain less details than the original versions. There are three circuits that can be accessed in this game mode, Clubman Stage Route 5, Special Stage Route 5, and Special Stage Route 11.
In Arcade Mode, the player must win on all the eight circuits, with all the three car classes, on Difficult level. Once unlocked, the HiFi Mode can be accessed on the Bonus section.