An exhaust muffler for an internal combustion engine, the exhaust muffler including a housing having a first end plate and a second end plate. The second end plate is disposed opposite to the first end plate. The exhaust muffler also includes an inlet pipe connected to the first end plate and an outlet pipe connected to the second end plate of the housing. A plurality of passages are disposed within the housing along a longitudinal axis of the housing, the plurality of passages have different lengths.