State vs aftermarket exhaust

[JAFO]

Here is an example of a very subjective law:

Oregon Revised Statute:

815.025 Causing unreasonable noise with vehicle; penalty. (1) A person commits the offense of causing unreasonable noise with a vehicle if the person operates upon any highway any motor vehicle so as to cause any greater noise or sound than is reasonably necessary for the proper operation of the vehicle.

(2) The offense described in this section, causing unreasonable noise with a vehicle, is a Class D traffic violation. [1983 c.338 §438; 1987 c.158 §171; 1995 c.383 §22]
http://www.leg.state.or.us/ors/815.html

[WormGod]

Passing gas in a public place is fairly unreasonable as well. Lock us all up.