well, I have my gripes with GT4. Like autosave. I liked my 110K credits. I wanna be able to buy a car with it, trick it out, have my fun, reset, and do it all over again with a dif car. I can do that with GT4, but I have to reset my Playstation, coerse it into letting me into my memory card, manually delete the info, and then start all over from scratch and re-import everything. And if I am further than the beginning of the game? tough noogies!
As far as drifting, I dont like the major over-correction feel, its very un-realistic. When I drifted my AE86 in real life, that effect was halfway in between the physics of GT3 and the physics of GT4.
As far as boosting power, I never did that in GT3, the highest hp car I drifted was around 400hp, and most of them were closer to 280-320.
As far as the codes, I tried all three types on both V3 codes, and code breaker codes, no luck yet, still trying.