I’m guessing this is to slow the Mopars down

This is for the X class.
These cars only have a chassis certified to 7.50.
The rule change was implemented to keep them from going quicker than 7.50.
Chevys got hit this week after Dallas.
My opinion is that it should have been done across the board for every manufacture at the same time.
NHRA will argue each mfg responds differently, that's the reason for delay.