209 of can section 204 against wall section 207 and barrier wall 207 an inlet port 211 is formed through wall 214 of the pipe section to communicate with the exhaust port of the engine to which the muffler 201 is attached 0032 fig6 illustrates a side sectional view of the can portion 204 of the muffler of the second embodiment which view is taken at line 6 6 of fig4 can section 204 has an external housing shell 215 which is a constant height rectangular wall forming the external shape of the can section 204 shell 215 is attached to a flat can wall section 209 and forms internal expansion compression chamber 217 therein this chamber is made into an ell shape by the addition of internal wall section 216 which is attached to can wall 209 and is of equal height to housing wall 215 a closed chamber or dead space 219 results from the ell shape of chamber 217 an inlet port 212 is formed through wall 209 of can section 204 and communicates with u shaped passage 210 of pipe section 203 preferably inlet port 212 is located on the opposite side of barrier wall 207 from inlet port 211 coming from the exhaust valve of the engine a.