Vern is correct, this is happening everywhere. At Great Lakes Dragaway in Union Grove, WI, they've got a curfew for racing - 11pm regardless of circumstances. There will be events postponed or stopped because of the curfew. Then the racers will have to be finished another day.
In the "good old days", the race would run till completed then there was the all night bonfire party!!!
If I thought doing any one specific thing (mufflers) would fix the NIMBYs, I'd support it. But, if I've learned one thing from watching politics... Incrementalism is the way to eliminate things. Once the opposition gets mufflers, then they'll find something else to whine about. Maybe leaded racing gas, or traffic congestion???
Some times you have to stick to your guns. The track owners ought to be dealing with the developers and zoning people when the proposed subdivision or zoning change request is first placed on the table.
JMHO
Blair