The world used several solutions exhaust systems of motor vehicles. Today, in addition to the core function of which
is to discharge exhaust gases from a combustion engine and noise reduction, these systems must comply with the
functions associated with aftertreatment and impact on the characteristics of the engine. Requirements increase for noise
suppression, at the tendency to increase engine efficiency and reduce fuel consumption. On the other hand, it seeks to
reduce production costs. All this forces the search for new solutions and improve existing ones. In the process of the
combustion gases discharge it is also important to eliminate frequency bands especially harmful to people and the
environment (including other living organisms). Our goal is to develop a new design muffler of exhaust system that will
meet these expectations of producers and users of vehicles. For this purpose, mathematical analysis of a classical systems
with circular holes in the perforated pipes and proposed by the authors of the longitudinal gaps systems was performed.
The paper presents some aspects of mufflers modeling for reducing acoustic noise emitted from the vehicle. Basic
criterion for assessing was therefore the damping effect. Built theoretical models have allowed a rough estimate of
acoustic performance at specific frequency bands by determining the transfer impedances. Because the noise reduction in
automobiles is a complex, for the construction of such systems one of the important elements is to eliminate these
frequency bands of acoustic waves in the process of the exhaust gases discharge which are the most dangerous to
humans. The comparative analysis of these systems has allowed to determine the direction of further structural changes.
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