Noise cancelling device

A noise cancelling device, comprising:

• a first expansion chamber and a second expansion chamber, each having a cylindrical shape with a first end and a second end;
• an inlet extension pipe having a double wall, connected to the first end of the first expansion chamber;
• an outlet extension pipe having a double wall, connected to the first end of the second expansion chamber;
• and
• a connecting pipe, connecting the second end of the first expansion chamber and the second end of the second expansion chamber;
• wherein each expansion chamber comprises:
• a first element comprising:
• a first cylindrical portion having a double wall and a first diameter;
• a first circular base connecting to the first cylindrical portion;
• a second cylindrical portion connecting to the first circular base having a double wall and a second diameter,
• wherein the first and second cylindrical portions are axially aligned;
• wherein the first diameter is larger than the second diameter;
• wherein the first cylindrical portion has an extending outer lip;
• wherein the second cylindrical portion is slidingly engaged with the extension pipe;
• and
• wherein an inner wall of the second cylindrical portion is disposed in a gap of the double wall of the extension pipe;
• a second element comprising:
• a third cylindrical portion having a third diameter;
• and
• a second circular base connecting to the third cylindrical portion and the connecting pipe,
• wherein the second element is slidingly engaged in a gap of the double wall of the first element to form a cylindrical body;
• and
• wherein each of the expansion chambers, the connecting pipe, and the extension pipes have an inner diameter and an outer diameter;
• wherein the expansion chambers, the connecting pipe, and the extension pipes form a unitary body, wherein the expansion chambers, the connecting pipe, and the extension pipes are axially aligned along a longitudinal axis of all the cylindrical portions in the order of inlet extension pipe, first expansion chamber, connecting pipe, second expansion chamber, and outlet extension pipe, having a plane of symmetry perpendicular to the longitudinal axis at a center point of the connecting pipe.