Hi, I'm the person who first suggested this. Here is a photo showing you it works. It shows two GT5 saves (and backups) on the same PS3. You can do it like this on one account, just swapping discs depending what version you want to use or use separate accounts for each version.
It's good too because if people buy new discs then PD will make some money towards GT6. Win win if you ask me.
Personally I am not a fan of people using any hacked car online no matter how small the hack. I do not judge people who do, rather I leave that to their own conscience. My pet hate is people who steal DLC. That's just theft as far as I'm concerned. My opinion only so don't flame me please. I think people should experiment offline and have fun making unique cars then post videos or photos on the web to show off their creations.
I think it is the best solution. You can still play online happily with v2.12 and experiment offline with v2.11 and not get yourself banned or piss people off.
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