Patent ID: 8402756

Claim:
An exhaust system assembly comprising: an exhaust gas collector having an outer pipe with opposite first and second ends and an inner pipe disposed within the outer pipe so that an inner space is defined between the inner and outer pipes, the inner space being free of pipes therein other than the inner pipe, the inner pipe having a first end opening into the inner space between the inner and outer pipes and a second end opposite the first end; a first pipe for delivering exhaust gas from an engine to the exhaust gas collector, the first pipe communicating directly with the inner space of the outer pipe of the exhaust gas collector; a second pipe for delivering exhaust gas from an engine to the exhaust gas collector, the second pipe communicating directly with the inner space of the outer pipe of the exhaust gas collector at a location spaced from the first pipe; and a third pipe unitary with and communicating with the second end of the inner pipe of the exhaust gas collector, the third pipe being a tail pipe for emitting the exhaust gas delivered to the exhaust gas collector by the first and second pipes, wherein: a centerline pipe length extending along the second pipe from the engine to the first end of the inner pipe of the exhaust gas collector substantially equals a centerline pipe length of the first pipe from the engine to the inner space of the exhaust gas collector.