It’s less “shrubs OP” and more “collision scaling OP”.
At the moment your car always takes at least 10 percent of damage from collision, meaning that if you’re traveling at relativistic speeds, slamming really hard into anything will wreck something.
Unless I’m reading something wrong (vehicle.cpp is huge and full of formulas), the damage your car receives actually scales with its mass once you make it huge enough (early on it doesn’t, but then the 10% cap makes it happen).