John 92db is what we have had to meet both years we had our own standalone day. The ALMS weekends for the 250’s were unlimited. Last year we had 3 people bounced for noise. 2-250’s and a Yamaha. The yamaha made no attempt at all at quieting his down.
As for limits Laguna will have a definite kart limit. This was something that came together very quickly and at the last minute. We are still working to iron out all the details.
Willow Springs events will also have kart limits but they will be much easier to deal with.