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According to the Ralliart EVO MR brochure, this vortex generator was wind tunnel tested at 180km/h. Vortex Generator Test results (on 180km/h): Rear downforce: + 2kg = 35% UP Air Resistance (CD) : 1.1% OFF This part only take 20 minutes to install and attaches by 3m double sided tape that is included.
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