Exhaust system and muffler

A muffler for use with an internal combustion engine, the muffler comprising:

• a first tube configured to receive a first exhaust stream, the first tube including a first inlet portion and a first area, a first outlet portion spaced apart from the first inlet portion and having a first outlet area, and a first intermediate portion extending between the first inlet portion and the first outlet portion;
• a second tube configured to receive a second exhaust stream, the second tube including a second inlet portion having a second inlet area, a second outlet portion spaced apart from the second inlet portion having a second outlet area, and a second intermediate portion extending between the second inlet portion and the second outlet portion;
• and
• wherein the first intermediate portion and the second intermediate portion cross each other, are at least partially stacked on each other, and are in fluid communication with each other and wherein the first inlet area is smaller than the second outlet area and the second inlet area is smaller than the first outlet area.

A muffler for use with an internal combustion engine, the muffler comprising:

• a first tube including:
• a first inlet portion defining a first inlet configured to receive the first exhaust stream, wherein the first inlet portion is disposed along a first axial plane and has a first inlet area;
• a first outlet portion defining a first outlet and disposed along a second axial plane, wherein the second axial plane is vertically spaced from the first axial plane and has a first outlet area;
• and
• a first intermediate portion extending from the first inlet portion to the first outlet portion, wherein the first intermediate portion is fluidly coupled to the first inlet portion and the first outlet portion;
• and
• a second tube including:
• a second inlet portion defining a second inlet configured to receive the second exhaust stream and having a second inlet area, wherein the second inlet portion is spaced apart from the first inlet portion and disposed along a third axial plane;
• a second outlet portion spaced apart from the first outlet portion and defining a second outlet and having a second outlet area, wherein the second outlet portion is disposed along a fourth axial plane that is vertically spaced from the third axial plane;
• and
• a second intermediate portion extending from the second inlet portion to the second outlet portion, wherein the second intermediate portion is fluidly coupled to the second inlet portion, the second outlet portion and the first intermediate portion,
• wherein the first intermediate portion and the second intermediate portion cross each other and are at least partially stacked on each other defining a common chamber and,
• wherein a diameter of the first tube has an outer surface that defines a changing, non-uniform cross section of the first tube from the first intermediate portion to the first outlet portion and a diameter of the second tube has an outer surface that defines a changing, non-uniform cross section of the second tube from the second intermediate portion to the second outlet portion.