Embodiments in accordance with the present disclosure may provide a muffler comprising an enclosure. The enclosure, in one example, may include a relatively thin volume fittable under a preselected feature of a vehicle, and at least one relatively thick volume fittable alongside the preselected feature. The enclosure may also include an exhaust gas entry port and a tailpipe exit port. In one example, partitions may be within the thin volume forming an expansion chamber at the entry port and a tailpipe extension at the exit port.