Hate to break it to ya but last I checked APR doesn't have wind tunnel data. They have CFD data, but not wind tunnel. Even if they did, it would be irrelevant unless it was on another 370Z. Even their CFD data is somewhat irrelevant unless you have your wing mounted up above the roofline in clean air as the CFD data represents the wing in a clean airstream.
In all likelihood the actual Nismo 370Z wing was probably wind tunnel tested, on a 370Z. Being that this is the same design, but higher and a bit wider, so on paper, this should be more effective than the factory Nismo spoiler. Still probably not as much downforce as an APR, Kognition, or other big wing but that's not necessarily a bad thing either depending on the rest of your car's aero work. If you don't have the front aero grip to match the rear then you're making your car handle worse.
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