if I understand correctly, this issue and many other functionalities can be solved by using PhysX Contact Modification. This PhysX snippet does it and I believe that PhysX vehicle movement component might be using it too:
https://github.com/NVIDIAGameWorks/P…ContactMod.cpp
The application goes way beyond just ignoring collision between certain components but allow to put rules in place as to how collision will be resolved. Like for example, a vehicle as in Mario Cart, during collision with wall can be forced to just slide along the wall instead of flying over the wall as result of collision.