Is it still possible to boost the power of the racing cars unrealistically? I'm hoping not, but if it can get you through the races that are between you and the Extreme Hall, then perhaps it could serve a purpose.
I've noticed that apparently some of the enduros give out prize winnings of 10M and 15M. Is this for the same version that has the starting credits of 1M, or is it the "adjusted" version similar to the North American games, where 10K is the starter amount? Because I'm not looking forward to a 4 hour race for a measly 150 thousand.
I think GT4 will last me a long while. There's the urge to rush through the first time simply to see what's in there, but my main goal is to gold the licenses, then just do some hotlapping in a (multiple) handful(s) of cars. I'm not too interested in grabbing 100% quickly though; I still haven't done it in GT3. It's all about having all the cars I want, how I want, to drive wherever I want.