RGH/JTAG consoles are stable, though RGH1.2/RGH3 models may have variable boot times, while JTAG boots instantly. What is JTAG/RGH?

The game benefits greatly from running on an RGH/JTAG system with a hard drive, reducing the long loading screens common in the original retail release.

Allows for easy installation of all released DLC, including additional tracks and car packs, which are otherwise hard to obtain.

Avoids the potential "Disc Read Error" common with older, heavily played copies of the game. Performance Notes

A hardware modification that allows the Xbox 360 to run unsigned code, homebrew, and game backups from the hard drive or USB storage.