Exhaust system tuner tube to reduce standing wave

A muffler assembly for an exhaust system of a vehicle engine emitting exhaust gas, and the exhaust system including a collector and an exhaust conduit providing exhaust gas to the muffler assembly, the muffler assembly comprising:

• a housing defining an enclosed volume;
• a primary pipe including a primary pipe inlet and a primary pipe outlet, the primary pipe extending through the enclosed volume;
• a valve operable to restrict flow through the primary pipe;
• a resonance length configured to be defined by a length of the exhaust system that extends from the collector to the valve;
• a secondary pipe including a secondary pipe inlet positioned in fluid communication with the enclosed volume and a secondary pipe outlet positioned outside of the enclosed volume;
• a tuner tube including an open tuner tube end in fluid communication with the primary pipe and a closed tuner tube end that is opposite the open tuner tube end, the tuner tube having a tuner tube length substantially one-quarter of the resonance length;
• a bleed port formed in the primary pipe and in fluid communication with the enclosed volume, the bleed port being positioned downstream from the open tuner tube end;
• and
• a bleed tube including a first bleed tube end in fluid communication with the primary pipe and a second bleed tube end, wherein the bleed port is disposed at the second bleed tube end.

A muffler assembly for an exhaust system for a vehicle engine emitting exhaust gas, and the exhaust system including a collector and an exhaust conduit providing exhaust gas to the muffler assembly, the muffler assembly comprising:

• a housing defining an enclosed volume;
• a primary pipe including a primary pipe inlet and a primary pipe outlet, the primary pipe extending through the enclosed volume;
• a first valve operable to restrict flow through the primary pipe;
• a first resonance length defined by a length of the exhaust system that extends from the collector to the valve;
• a secondary pipe including a secondary pipe inlet positioned in fluid communication with the enclosed volume and a secondary pipe outlet positioned outside of the enclosed volume;
• a tertiary pipe including a tertiary pipe inlet and a tertiary pipe outlet, the tertiary pipe extending through the enclosed volume;
• a first tuner tube including an open first tuner tube end in fluid communication with the primary pipe and a closed first tuner tube end that is opposite the open first tuner tube end, the first tuner tube having a first tuner tube length of substantially one-quarter of the first resonance length;
• a first bleed port formed in the primary pipe in fluid communication with the enclosed volume, the first bleed port being positioned downstream from the open first tuner tube end;
• a second valve operable to restrict flow through the tertiary pipe;
• a second resonance length defined by a length of the exhaust system that extends from the collector to the second valve;
• a second tuner tube including an open second tuner tube end in fluid communication with the tertiary pipe and a closed second tuner tube end that is opposite the open second tuner tube end, the second tuner tube having a second tuner tube length of substantially one-quarter of the second resonance length;
• and
• a second bleed port formed in the tertiary pipe tube in fluid communication with the enclosed volume, the second bleed port being positioned downstream from the open second tuner tube end.