93 was the level, i believe they changed it to 97 at sand lake. Sound Levels
Decibel limit for Oregon Dunes National Recreation Area is 93 decibels.
Find out more about noise limits and sound tests for the Oregon Dunes .
Decibel limit for Sand Lake Recreation area is 97 decibels.
also, heres a chart of db levels for different exhausts: http://www.fs.fed.us/r6/siuslaw/recreation/ohv/sound.shtml