I noticed that, too.people saying the damage is only visual.. look at this video
http://www.gamersyde.com/stream_gran_turismo_5_gamescom_damages-12436_en.html
from 11secs you can see the car is wobbling left to right just as if somthing is broken, its not side to side like the steering is being turned, but the car is shaking side to side due to suspention damage its only a small wobble but its noticable..