Iowa Admin. Code r. 571-46.12 - Sound level limitation
No person shall operate an all-terrain vehicle or off-road motorcycle that is constructed or altered in a manner that noise emitted from the all-terrain vehicle or offroad motorcycle exceeds 96 decibels on the A scale when measured in the manner prescribed in the revised 2017-04, Society of Automotive Engineers Standard J1287, titled "Measurement of Exhaust Sound Pressure Levels of Stationary Motorcycles."
Notes
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.
[ARC 8878B, IAB 6/30/10, effective 8/4/10]