Okay, this may take a while to read, but this tells you some of the main fetures in Carbon:
Firstly, although there are cops, they don't play as bigger role as they did in Most Wanted.
Secondly, although I know you've completed MW, this game is a follow on to Most Wanted. Apparently one night in the new city called Palmont City your character fled for Rockport because the heat was getting too high. Now he's come back and things aren't what they used to be.
The third new thing in NFSC is Muscle cars. 1969-2006 is the year range, so there should be plenty of variety.
Some cars that are returning from Most Wanted:
Lambo Murcielago
Merc SLR McLaren
Porsche Carrera GT
Chevrolet Corvette Z06
Dodge Viper SRT-10
Mazda RX-8
Aston Martin DB9
The challenge series is making a return, and you can get some special spoilers and a couple of cars from this along with new vinyls and pearl window tint, etc.
AutoSculpt is freakin' awesome; you can sculpt wheels, fenders, roof scoops, spoilers and exhaust tips.
Thanx for your time!
Murcie is back.