Quote:
Originally Posted by monkeybike
I’m 95% sure that TRD stated that the louvers were a functional aerodynamic piece and shaped with airflow in mind.
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Marketing hyperbole.
Louvers only provide an aerodynamic benefit if they are open on both sides to allow air to flow out of a high pressure zone and into a low pressure zone. That's why they're used on hoods and fenders, or on rear-roof area of a mid-engine supercar. To alleviate pressure under hood or in wheel-well.
If no air is actually flowing through the louver, it's just creating turbulence as air attempts to fill the voids underneath each step. The resultant lack of a functional boundary layer on the rear of the car creates a lot of useless turbulent air, which will be fed to the spoiler.