Really great game but it hasn't changed much
Also it's not very realistic when it comes to engine tuning with some cars. For example in Underground there was like a level 1 2 and 3 when it came to performance of all cars but in Carbon; if you have a car like a Golf you can only get it to the equivalent of level 2 performance which is just a let down to be honest.
Also there's no Street X and there's no replay not even in single player!
What's nice is that there's a lot more customisation for you to do and drifting as become a whole lot faster (and I mean faster). I guess having the whole crew thing is cool but that's the only thing that's really different.
It's a good game overall but when I bought I expected it to be amazing! You'll definitely enjoy it but it could've been better.