The ornamental design for an exhaustpipe for a motorcycle, as shown and described.
FIG. 1 is a perspective view showing the rear, right side and top of an exhaust pipe for a motorcycle which forms my new design, the broken lines of a motorcycle being for illustrative purposes only and forming no part of my design;
FIG. 2 is a right side elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a front elevational view thereof; and,
FIG. 7 is a rear elevational view thereof.
The broken lines in FIGS. 3-7 are for illustrative purposes only and form no part of my design.