(625 ILCS 5/1-148.3a)
A device consisting of a series of chambers
or baffle plates or other mechanical design for the purpose of receiving
exhaust gas from an internal combustion engine or turbine wheels for the
purpose of receiving exhaust gas from a diesel engine, all of which are
effective in reducing noise.
(Source: P.A. 90-89, eff. 1-1-98.)