Patent ID: 7686130

Claim:
A dual-mode exhaust system for allowing a user to generate a desired audible sound from an existing muffler exhaust system of a vehicle, said dual-mode exhaust system comprising: a housing having an input port attached to the existing muffler exhaust system, said housing further having first and second output ports in fluid communication with said input port; means for selectively distributing vehicle exhaust from said input port to said first and second output ports such that the vehicle exhaust is prohibited from simultaneously passing through said first and second output ports during operating conditions; and first and second vehicle exhaust pipes coupled to said first and second output ports in such a manner that first and second distinct audible sounds are generated from the existing vehicle muffler exhaust system when the vehicle exhaust exits from said first and second output ports respectively; wherein said vehicle exhaust distributing means comprises: a controller electrically mated to an existing vehicle power source; a motor provided with an annular toothed gear attached thereto, said motor and said toothed gear being situated within said housing and rotating along clockwise and counter clockwise directions based upon a user input generated from said controller; upper and lower chambers vertically stacked within said housing, said lower chambers being in fluid communication between said input port and said first and second output ports, said upper chamber being vertically displaced above said input port and said first and second output ports respectively; first and second vertically spaced pendulum arms disposed within said upper and lower chambers respectively and anchored at respective distal ends thereof respectively, said first and second arms maintaining a fixed and static spatial relationship such that said first and second arms rotate in sync about a single fulcrum axis defined orthogonal to said distal ends respectively; and said first arm having a corrugated proximal edge directly interlocked with said toothed gear in such a manner that said first and second arms articulate along counter clockwise and clockwise directions when said toothed gear rotates along clockwise and counter clockwise directions respectively.