Pay attention folks,
Roll cages, Snell helmets and jacket rules will be enforced more and more, due to track insurance policies. KCIR is enforcing the jacket for turbos and NO2, but did not enforce the letter which does require a jacket if the SC is not a stock version.
KCIR also enforced the no pocket bikes or powered scooters due to NHRA rules. The changes are to keep all of us safe and hold down insurance costs. I expect the track to better enforce the cage rules next year.
Consider this a "Heads-up" and a warning.