Damage in each game is unique, cars deform realistically, in real time but with its limitations. However, there are pre-modeled damaged parts, often more than 20 or 30 with each one deforming depending the force and angle used against it.
FlatOutEditIn the first Flatout, car damage was very advanced for its time. A small bump would eventually result in a bumper or body deformation. There were many parts,
including doors, hoods, trunks, bumpers, pipes and exhaust pipes. You would even see a big amount of small car pieces lying on the ground. The basic car parts stay on the ground forever. Each damagable car, including the chassis was pre-modeled, but still the damage looks very realistic, but due to the pre-modeled damage, it has its limitations. Wheels cannot be removed but will still wobble if heavy damage hit them, performance could decrease quickly if hit hard enough. Suspension could also brake, making the car hop a lot more. Cars cannot be wrecked at all, but still they can catch fire, partly blocking player's view.
FlatOut: Ultimate Carnage still remains basicaly the same as previous games in the series. However, the game has a reworked engine, having the most realistic damage of all. There are more than 40 car parts deforming on their own, depending force and angle. Wheels can be removed, and also cars can explode from too much damage.