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Originally Posted by Chad86
What about with the TRD spoiler???
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I don't have any info there, some searching didn't yield any data about it. It doesn't have the protrusions jutting off of the sides, has a higher tail that creates more downforce at the likely cost of greater turbulence, and doesn't have the small bumps that look like they act as vortex generators.
I'd bet that the TRD spoiler increases the coefficient of drag, but don't treat my word as gospel on that.