The Mile Hi Snowmobile Club has an authorized dB meter which we have available to test sleds. Anyone interested, PM me.
As a side note, the 5 yr old SLP can on my sled registered 90dB. Two factors may have increased the sound: my stock pipe is cereamic coated and may have added some dBs and my clutch comes in at 3,500 rpm which puts a load on the engine at 4,000. I refused to run the 4,000 as I did not want to fry my belt. Tom M of State Parks did not know how to deal with that except to say the RPM range is 4,000 +/- 200 for 4 seconds.
Even though we were told that only obvious, obnoxious sleds would be scrutenized, I decided to give up the 7# weight advantage of the SLP and reinstall the stock can--maybe the extra weight of the stock can on the right side of my sled will help me side hill to the right better. Also, I don't think the FS will be as forgiving as State Parks, and they are everywhere.
BCB