Patent ID: 7347046

Claim:
An exhaust system for a vehicle comprising: a muffler; at least one sidewall enclosing an interior space of the muffler; a first pipe disposed within the interior space of the muffler and extending from one end of the muffler at which exhaust gas enters the muffler; a catalyst located in the first pipe; and at least one additional pipe disposed within the interior space such that a longitudinal axis of the at least one additional pipe is spaced from a longitudinal axis of the first pipe in a direction that is substantially perpendicular to the longitudinal axis of the first pipe; wherein an outer peripheral surface of the at least one additional pipe does not include holes; and said first pipe includes a plurality of holes disposed in a sidewall thereof at an upstream side of the catalyst in a direction in which exhaust gas passes through the muffler, such that some of the exhaust gas passes through the catalyst and the remainder of the exhaust gas passes through the plurality of holes so as to bypass the catalyst.