Spoiler

A spoiler is an aerodynamic feature typically attached to
the rearmost upper edge of the trunk and extending sometimes
to the top of the rear quarter panels. Another common position
for a spoiler is at the base of the front bumper. Spoilers
in this position are sometimes referred to as 'lip spoilers'.
A spoiler changes the direction of the airflow around a vehicle
in order to reduce lift or aerodynamic drag, and/or improve
engine cooling.
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