This mod reduces the impact required to detach the rear wings and hence make the damage visible. The Mod is for all cars except 90s. Front wing damages for 80s cars are included too.
There are options for the ease of detachment and this also cater for people using different damage settings in loose_parts_settings.xml.
Please note that the detachment of rear wings will be terminal and hence DNF. Options 3 & 4 should be more realistic.
Make backups and replace files accordingly.
For 80s cars too:
Reversing into barrier may detach wings for option 2, resulting terminal damage
Rear Wing Damage 1.0
visible rear wing damage