>i just started playing nfs carbon but im just wondering what class is the best?
If you mean which class to start off with, it doesn't matter that much, as long as you do Kempton first (muscle class) or second (exotic or tuner). This gets you Sampson, who increases your winnings by 10%. To make a bit more money, only go for 2 out of 3 events in each section to dominate until you unlock Sampson. Note that Sampson doesn't help with checkpoints or canyon events, so do those as the 2 out of 3.
If you mean which cars are fastest, then here's the list:
Tier 1 - 240SX (or Mazda speed3 if you don't have 240SX)
Tier 2 - Lotus Elise (VW R32 for canyon events)
Tier 3 - Corvette Z06 (or Audi Lemans custom car)
Note if you're going for all rewards in career mode, you end up selling all of your career cars, so it's not important to have the best cars during career.
well i love muscle