The secret tuning parts still work.I have not noticed any difference at all. A friend of mine and I time trial continually at Nordschleife in Ruff RGTs at 500pp stock on SH tires and we have just both set personal best times as of Tuesday after 2.12 update.
If the physics had changed we would be well aware of it believe me.
I would also like to add that it has not stopped hacked cars either as they are still out there. We had to kick one out 2 nights ago :-(
If the physics had changed we would be well aware of it believe me.