The ornamental design for a throttlebodyadapter, as shown and described.
FIG. 1 is a perspective view of a throttle body adapter showing my new design in use.
FIG. 2 is an alternate perspective view thereof.
FIG. 3 is a left side view thereof.
FIG. 4 is a front view thereof.
FIG. 5 is a back view thereof.
FIG. 6 is a top view thereof.
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a right side view thereof.
The broken lines showing parts of an engine in FIG. 1 depict environmental subject matter only and form no part of the claimed design. The broken lines shown on the adapter throughout the views are for the purpose of depicting unclaimed portions and the boundaries of the claimed design.