I have a 250 two stroke with a FMF Turbin-core silencer and I have always been under the 96 db limit, although I did notice it creeping up to the 96 mark as the packing got older.
At a recent district enduro one of our club members failed sound test on his 500 Kawi 2 stroke and we were all scrambling around trying to repack his silencer. We got it down some but it was still slightly over the 96 mark. I guess it was close enough and they let him slide.
When the line at sound check gets too long they have been known to just go down the line and passing anyone with a FMF Q or FMF Turbin Core silencer.
Is your silencer also a spark arrestor? That is usually a requirement to race on any US Forest Service or BLM land. There is a little fudge room on sound but spark arrestor is rather black / white.
If you haven't repacked your silencer recently I would recommend doing it. Or at least bring new packing and whatever you need to change it with you to the race.
Rod