And this along with other things proves how unsuitable for future games GT5's assets will be (higly doubt that there will ever be a GT6) despite the claims on the contrary.
Sure they modeled the stitches for the interior of the cars (that's mad and a very bad way to spend resources) but they didn't model the cars in a way they could accept in the future a realistic damage model (for example engine bay) or the suspension components of the cars (wheels falling off etc). They didn't need to be 100% precise (as they were with the stitches) they just needed to keep a balance. 💡
Enjoy GT5 for what is worth, there won't probably be another...