Patent ID: 7246680

Claim:
An automotive exhaust system for an internal combustion engine for routing an exhaust gas stream from the internal combustion engine to atmosphere, the automotive exhaust system comprising: a first outlet, in fluid communication with the engine, including a first exhaust manifold; a second outlet, in fluid communication with the engine, including a second exhaust manifold; a Y-pipe, located downstream from the first exhaust manifold and the second exhaust manifold and having a first inlet in fluid communication with the first exhaust manifold, a second inlet in fluid communication with the second exhaust manifold, and a single outlet located downstream of the first inlet and the second inlet; at least one of a resonator and a muffler, located downstream of the Y-pipe and in fluid communication with the single outlet of the Y-pipe; and a sound dampening assembly including a bottle portion having a single opening and an interior defining a predetermined bottle volume, and a neck portion having first end attached to the single opening and extending from the bottle portion, the neck portion in fluid communication with the interior of the bottle portion and having a second end, in opposed relation to the first end, attached to and in fluid communication with the Y-pipe, the neck portion having an interior defining a predetermined neck volume, the predetermined bottle volume and the predetermined neck volume sized to attenuate vibration at a predetermined frequency in the Y-pipe.