All Gran Turismo 5 cars can take damage
IGN spoke to a Sony representative at the Tokyo Game Show and he confirmed that all cars will support deformation, such as scratches, and mechanical damage, that will affect the performance of the car in a big way.
However, racing cars will suffer from damage in a lot bigger way where crashing can cause multiple panels and doors to fall off.
This small limitation on production cars is due to car manufacturers wanting their vehicles to appear like solid tanks that can withstand a lot of bad driving.
Still, we are very happy with this news, but we know that many people will never be satisfied until full damage can be sustained by any car.