FIG. 1 is a perspective view of a first embodiment of an exhaust pipe for a vehicle according to my new design; FIG. 2 is a front view thereof; FIG. 3 is a side view thereof. FIG. 4 is a perspective view of a second embodiment of the exhaust pipe for a vehicle according to my new design; FIG. 5 is a front view thereof; and, FIG. 6 is a side view thereof. The broken lines are for illustrative purposes only and form no part of the claimed design.