A vehicle engine undercover assembly 14 for a vehicle is provided that comprises at least one substantially polyhedral-shaped vortex generator 20 in the airflow passing under the vehicle. Vortex generator 20 comprises at least one front-facing inclined surface, forming a leading surface of vortex generator 20, and at least one rear-facing surface forming a trailing surface of vortex generator 20 that further comprises an airflow outlet (50, Figure 4A) communicating between an interior space of the vehicle and the underside of the vehicle, which may increase aerodynamic and acoustic performance and which may also generate a pressure difference as well as cooling an engine bay. Suitably, a plurality of pyramidal vortex generators 20 may be provided and each may have a height between 15 mm and 25 mm and/or a length of double its height. Ridges 25 may also be provided on undercover 14 and channels may be defined between ridges 25.
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