The ornamental design for a frontend of an automobile exterior, as shown and described.
FIG. 1 is a front view of a front end of an automobile exterior showing our new design;
FIG. 2 is a front and left side perspective view thereof;
FIG. 3 is a rear and right side perspective view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof; and,
FIG. 6 is a top view thereof.
The portions of the vehicle shown in de-emphasized and half-tone portions outside the broken lines and the broken lines representing the boundary and configuration of what is claimed as the design are for environmental and illustrative purposes and form no part of the claimed design.