FIG. 1 is a perspective view from the front forward side of a motorcycle muffler.

FIG. 2 is a perspective view from the front backward side thereof.

FIG. 3 is a perspective view from the rear backward side thereof.

FIG. 4 is a front elevation view thereof.

FIG. 5 is a rear elevation view thereof.

FIG. 6 is a top plan view thereof.

FIG. 7 is a bottom plan view thereof.

FIG. 8 is a left side elevation view thereof

FIG. 9 is an enlarged perspective view from the front forward side of the vicinity of the claimed design.

FIG. 10 is an enlarged perspective view from the front backward side of the vicinity of the claimed design.

FIG. 11 is an enlarged front elevation view of the vicinity of the claimed design.

FIG. 12 is an enlarged left side elevation view of the vicinity of the claimed design.

FIG. 13 is an enlarged top plan view of the vicinity of the claimed design.

FIG. 14 is an enlarged bottom plan view of the vicinity of the claimed design; and,

FIG. 15 is an enlarged rear elevation view of the vicinity of the claimed design.

The broken line showing of an entire motorcycle except for a portion of the end of the exhaust system as shown in FIGS. 1–15 is included for the purpose of illustrating environment and forms no part of the claimed design.