35 Ill. Adm. Code 905.101
Exhaust Systems
Section 905
Section 905.101Â Exhaust
Systems
a)Â Â Â Â Â Â Â Â No person shall operate or cause or allow the operation of a
snowmobile unless the exhaust system of such snowmobile is:
1)Â Â Â Â Â Â Â Â free from defects which interfere with sound reduction;
2)Â Â Â Â Â Â Â Â equipped with a muffler or other sound dissipative device;
3)Â Â Â Â Â Â Â Â not equipped with a cutout, by-pass or similar device.
b)Â Â Â Â Â Â Â Â No person shall install any parts in or modify the cooling,
intake, or exhaust system of a snowmobile in a manner which will amplify or
increase the sound level emitted by that snowmobile above the level emitted by
such snowmobile with the equipment originally installed on the snowmobile.
c)Â Â Â Â Â Â Â Â No person shall operate or cause or allow the operation of a
snowmobile which has been modified in a manner which will amplify or increase
the sound level emitted by that snowmobile above the level emitted by such
snowmobile with the equipment originally installed on the snowmobile.