i dont have xbox but in terms of gt3 vs gt4 i have noticed:
1) the tracks are tigher
2) alot more blind turns
3) more complex turns(ie a "4" turn changes to a "2" turn)
4) when u hit a wall or car, your screen briefly shakes
5) braking is a lot more realistic
6) not as easy to recover when at high speeds
7) tracks are not as smooth...alot more bumps
this game is so much more complete

they originally said they were going to impose a penalty system so intentionally hitting an oppenent would cause you a time penalty or a black flag but i havent seen it...im 3 laps from my super license

ps if you guys havent already...go in simulation, then home, then status, then hit the start button to upload gt3 credits....and buy a new car, only after buying used cars did i figure out how to buy a new car
