Exhaust muffler and muffler system for use with an internal combustion engine

An exhaust muffler for use with an internal combustion engine, said exhaust muffler comprising:

• a hollow main body having a plurality of bulkheads therein, said bulkheads dividing the interior of said main body into a plurality of expansion chambers;
• said main body being connectable to an exhaust pipe of an internal combustion engine;
• a plurality of communicating pipes fixed in said main body so as to connect the expansion chambers;
• and
• a spark arrester which is removably attachable to said main body and which comprises a tail pipe,
• wherein said muffler is configured such that when the spark arrester is installed, exhaust flow is made to pass through at least one bulkhead three times by the spark arrester installed so as to connect the expansion chambers and by the plurality of communicating pipes fixed so as to connect the expansion chambers,
• and when the spark arrester is removed, exhaust flow may pass straight through a through-hole opening in each of the bulkheads and outwardly from said main body so as to be released outside of said exhaust muffler.

An exhaust muffler system for use with an internal combustion engine, said exhaust muffler system comprising:

• a hollow main body defining an enclosed space therein, said main body having first and second bulkheads therein which operate to separate said enclosed space into a plurality of expansion chambers, said second bulkhead having a hole formed therethrough for receiving a spark arrester;
• said main body being connectable to an exhaust pipe of an internal combustion engine;
• a plurality of communicating pipes fixed in said main body so as to connect the expansion chambers;
• a regular spark arrester which is selectively removably attachable to said main body to define a regular configuration of said muffler system for use in public road travel, and which comprises a tail pipe, wherein a portion of said regular spark arrester fits through said hole in said second bulkhead;
• and
• a racing spark arrester which is alternately attachable to said main body to define a racing configuration of said muffler system, wherein said hole in said second bulkhead is left open and unobstructed in said racing configuration.

An exhaust muffler system for use with an internal combustion engine, said exhaust muffler system comprising:

• a hollow main body defining an enclosed space therein, said main body having a plurality of bulkheads therein which operate to separate said enclosed space into a plurality of expansion chambers, at least one of said bulkheads having a hole formed therethrough for receiving a spark arrester;
• said main body being connectable to an exhaust pipe of an internal combustion engine;
• a plurality of communicating pipes fixed in said main body so as to connect the expansion chambers;
• a regular spark arrester which is selectively removably attachable to said main body to define a regular configuration of said muffler system for use in public road travel;
• and
• a racing spark arrester which is alternately attachable to said main body to define a racing configuration of said muffler system.