Originally posted by murky1
Just buy a disc from a different region. That way you can have two game data files. One updated 2.12+ for online racing with clean cars. The other only updated to 2.11 for experimenting.
GT5 is cheap as chips on eBay now.
This could be a great solution. Are you sure there can be two different GT5 games together on one PS3 providing they are from different regions?
I think you should start the other region version with a new psn account, else your psn data will change a lot from what it was. Not sure if that is a problem, sort of the same as restarting the game i guess.