Agree, Carmageddon 2's physics still feel modern to this day. I can't think of any other game except Beam NG perhaps that achieves the same level. But the impacts in Carma 2 seem to suprass even that one.
I do wish there was a way to set up physics demonstrations, in all the games, for comparison with other engines. Certainly, the common boxes-made-of-jelly issue [2] is something I'm sure you wouldn't see from Carmageddon, though you'd probably see devastating performance issues with that same test.
Carmageddon 2 did notably lack (as far as I could tell) simulations of aerofoils and other surface dynamics and their effects on handling; cars seemed to be modelled as near-blocks as far as drag was concerned.
[1] https://steamcommunity.com/app/249380/discussions/0/34378855...
[2] https://kripken.github.io/box2d.js/demo/webgl/box2d.html