Need for Speed Carbon Hints Win Speedtrap Races Whenever you get a speedtrap race use Neville to block your opponents before the speedtrap because this will stop the cars, causing them to have a lower total than you. But it has to be done right! Bonus Cars Complete career mode with any car class to unlock 5 bonus cars, including the Audi Quattro Le Mans Racing car Muscle Car Flip When you are driving an old muscle car, go as fast as you can in reverse, turn the steering wheel to one side full lock while giving the car full throttle in 1st gear. The car will flip over sideways and land on its tires perfectly. This is a cool trick to show off with. Kinda pointless though.