Patent ID: 8453672

Claim:
A passive valve assembly for an exhaust system comprising: an exhaust tube having a bore defining an exhaust flow path having a cross-sectional area, said exhaust tube having one end to be connected to a first exhaust component and a second end to be connected to a second exhaust component, said exhaust tube having only one inlet and only one outlet such that said exhaust tube forms a sole exhaust path extending between the first and the second exhaust components; a vane mounted within said bore and being moveable between an open position and a closed position, said vane providing 80% to 97% coverage of said cross-sectional area when in said closed position, and wherein a length of said exhaust tube extending between said one end and said second end is greater than a diameter of said vane; and a resilient member that biases said vane toward said closed position, said vane solely being moveable from said closed position toward said open position in response to an increased pressure of exhaust gas flow that exceeds a biasing force of said resilient member.