gases as they impinge upon first barrier 32 however they become reflected from the first barrier 32 and increasingly diverge from or become transverse to the flow of the exhaust gases as the exhaust gases move first compartment 34 it is believed that a substantial number of sound components will be reflected thus sound components reverberate back and forth between interior surfaces defined by within first compartment 34 and tend to cancel or attenuate each other out it is further hypothesized that the reduction in back pressure in the muffler device 10 could be the result of any one of three possible sources first it will be seen especially in fig5 that exhaust gas flow must partition immediately in order to proceed the second compartment 42 the exhaust stream indicated by arrow 58 is immediately once again partitioned in second compartment 42 upon entry into the third compartment 70 three exhaust streams are created which are then rejoined in fourth compartment 82 accordingly as a result of the redirection of the exhaust streams a lower back pressure may be achieved a second phenomena which may be occurring is that as exhaust gases pass from first compartment 34 to second compartment 42 there may be venturi effect with respect to the volume thereof in the second compartment 42 that lowers the pressure therein this lower pressure has a scavenging effect which causes the muffler back pressure to be relatively low however the lower pressure of the second compartment does not result in a build up of unignited fuel because live fire from the first compartment 34 may easily be transmitted to the second compartment.