I hope this wasn't posted before.
1. When u are flipped on side and some one tries to flip u back on wheels he hits u in the bottom where is drive shaft (pic 1) (for rwd and awd cars) when he hits he should broke that. Same should happen when u are driving through big jump , and land badly.
2. If u drove into the wall like me (pic 2,3) firstly wheels should be moved more in side, secondly i u hit like that i think this part should be broken too (pic 4) isn't it?