An exhaust component includes at least one muffler that has an inlet and an outlet. One pipe body is connected to each of the inlet and the outlet. The pipe bodies each have first and second ends that define a respective overall pipe length. Each pipe body defines a sole exhaust flow path between their...http://www.google.com.au/patents/US7628250?utm_source=gb-gplus-sharePatent US7628250 - Passive valve assembly for vehicle exhaust system
