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I would be there is little to no downforce from that wing. It's not raked like a spoiler, and I bet it's too close to the trunk lid to really have good enough flow to act as in inverted airfoil.
I'll bet the most it does is help reduce drag by spoiling the air off the back of the car (and thus helps freeway fuel mileage a little).
Take a look at the massive STi spoiler or the Spec-C wing (or actual race cars for that matter)... that's what a wing needs to look like for it to be downforce functional, and even then you need to be hauling the mail for it to really make a difference.
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3 turbos, 28 cylinders, 96 valves, 18 cams, 1400hp/1600ftlbs: '09 Outback XT / '06 Outback Sedan / '02 WRX / '94 SVX / '01 F-250 SuperDuty
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