OK more crashing...
I manually installed the 1.67d patch (auto-installer ran but didn't actually install anything), then switched over to the newest modding tools.
I modded 39 cars with camera and IK changes, and no matter what the 40th mod is, whether it's a cam+IK change, or a physics change, it crashes the game.
It doesn't matter which cam or IK set I choose, and it doesn't matter which car I change the drive type on, it crashes the game no matter what on the 40th mod.
I even tried taking one of the cam changes off, and it still crashed.
Attached are the working and broken DB.bnk files, it doesn't look like the DB_US.bnk has anything to do with it because I restored that file and it still crashed.
The only change in the broken file was a cam+IK change on the Saturn Curve to the Audi TT set. I also tried different changes on different cars, and no matter what the change was, it crashed.