Just finished GT4. Holy fuck, that last tournament was ass, I used a Mazda 787B black. I had to use save states because I didn't want to repeat a 15-min race because of some stupid mistake; I should have chosen easier opponents instead of racing against LMPs only. If you want to try that, I recommend either going NA or using a smaller turbo on tighter circuits (like Opera Paris) so you don't have to deal with turbo-lag as much.
https://youtu.be/pGPOrr74HYA
Is GT5 worth emulating?