Straight through muffler with conically-ended output passage

A muffler for an internal combustion engine, said muffler comprising:

• an outer shell having a first end cap and a second end cap;
• an inlet tube inserted into said first end cap, said inlet tube being connected to said outer shell by a first partition and said first end cap, said inlet tube having a plurality of perforations,
• a tuning chamber defined by said inlet tube, said outer shell, said first partition and said first end cap;
• an outlet tube having a funnel shaped element having an open large diameter end, said funnel shaped element inserted into said second end cap of said outer shell, said large diameter end of said funnel shaped element having a diameter larger than a diameter of said inlet tube, said outlet tube being connected to said outer shell by said funnel shaped element and said second end cap, said outlet tube having a plurality of perforations;
• an outlet chamber defined by said outlet tube, said outer shell, said funnel shaped element and said second end cap;
• and
• said funnel shaped element positioned in an expansion chamber and conically tapering to a junction with a cylindrical neck element extending into an inlet end of said outlet tube.

A muffler for an internal combustion engine, said muffler comprising:

• an outer shell having a first end cap and a second end cap;
• an inlet tube inserted into said first end cap, said inlet tube being connected to said outer shell by a first partition and said first end cap, wherein said first partition and said first end cap are spaced at a distance apart of between 3 and 4 times a diameter of said inlet tube;
• a tuning chamber defined by said inlet tube, said outer shell, said first partition and said first end cap;
• an outlet having a funnel shaped element having a large diameter end, said funnel shaped element inserted into said second end cap of said outer shell, said large diameter end of said funnel shaped element having a diameter larger than said diameter of said inlet tube, said outlet tube being connected to said outer shell by said funnel shaped element and said second end cap, said outlet tube having a plurality of perforations;
• an outlet chamber defined by said outlet tube, said outer shell, said funnel shaped element and said second end cap;
• and
• said funnel shaped element positioned in an expansion chamber and conically tapering to a junction with a cylindrical neck element extending into an inlet end of said outlet tube.