Quote:
Originally Posted by piers.singer
It's interesting to note how small the OEM deflectors are compared to some of the DIY jobs on here (if you've acres of coroplast then you might as well use it), maybe the manufacturers are saving material/cost or maybe they don't want the aero parts to impact on the car's styling.
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They are also looking at the simplest installation possible.
The larger flaps are also somewhat flexible; they will bend with airflow. I remember the early Ford Contours had flaps in front of the wheels. At the time I had no idea what they were there for.