Patent ID: 7628250

Claim:
A vehicle exhaust system comprising: at least one muffler having an inlet and an outlet, said outlet comprising a first pipe body having a first end located at said at least one muffler and extending to a second end to define a first overall pipe length, said first pipe body defining a sole exhaust flow path between said first and said second ends of said first pipe body, and said inlet comprising a second pipe body having a first end located at said at least one muffler and extending to a second end to define a second overall pipe length, said second pipe body defining a sole exhaust flow path between said first and second ends of said second pipe body; and a passive valve assembly mounted outside of said at least one muffler and within one of said first and said second pipe bodies, said passive valve assembly being positioned at a location within a first 25% of a respective one of said first and said second overall pipe lengths relative to an associated one of said inlet and said outlet of said at least one muffler.