try removing parts and until you find the part that is causing ur problem.Then you go to car mod folder, open Scripts folder, find the .cfg file of the problematic part and open it, inside you'll find phys mesh lines like this:
Spoiler: body 0.000 0.000 0.000 0.000 0.000 0.000 4.000 cars\racers\Toyota_Supra_A80_data\meshes\Physics_phys_F_bumper_1.scx
you just need to raise it a lil(the part in the red) or simply delete the line, your choice.