Abstract: An apparatus for engine exhaust sound attenuation includes a housing, a plurality of baffle plates arranged within the housing. The baffle plates are disposed apart from each other to define a plurality of intermediate chambers. The plurality of intermediate chambers includes a first resonant chamber proximate to the outlet chamber, a second resonant chamber proximate to the inlet chamber, a first intermediate chamber proximate to the second resonant chamber, and a second intermediate chamber proximate to the first intermediate chamber and the first resonant chamber. An inlet tube and an outlet tube are included. A first tube directs a flow of exhaust from the inlet chamber to one of the plurality of intermediate chambers via an interior of the first tube. Additionally, a second tube directs the flow of exhaust from a second one of the plurality of intermediate chambers to the outlet chamber via an interior of the second tube.

Abstract: An apparatus for engine exhaust sound attenuation includes a housing, a plurality of baffle plates arranged within the housing. The baffle plates are disposed apart from each other to define a plurality of intermediate chambers. The plurality of intermediate chambers includes a first resonant chamber proximate to the outlet chamber, a second resonant chamber proximate to the inlet chamber, a first intermediate chamber proximate to the second resonant chamber, and a second intermediate chamber proximate to the first intermediate chamber and the first resonant chamber. An inlet tube and an outlet tube are included. A first tube directs a flow of exhaust from the inlet chamber to one of the plurality of intermediate chambers via an interior of the first tube. Additionally, a second tube directs the flow of exhaust from a second one of the plurality of intermediate chambers to the outlet chamber via an interior of the second tube.

Abstract: An exhaust ejector tube is disclosed for use with an engine system. The exhaust ejector tube may have an exhaust pipe with an upstream end, a downstream end, and a plurality of flutes formed at the downstream end. Each of the plurality of flutes may have a rounded end that tapers toward the downstream end. The downstream end of the exhaust pipe terminates partway along a length of the plurality of flutes. The exhaust ejector tube may also have an ejector pipe with a smaller diameter than the exhaust pipe that intersects with the exhaust pipe. The second ejector pipe may have an upstream end located outside the exhaust pipe, and a downstream end located inside the exhaust pipe at the plurality of flutes.