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The Hyundai Genesis 5.0 R-Spec looks good on paper. With 429 horsepower, the R-Spec’s Tau V-8 outguns even the 420-horsepower twin-turbocharged V-8 in the 2013 Audi S6. At $47,385, the R-Spec costs less than a V-6-powered Infiniti M37. And with four logos on the trunk, the Hyundai Genesis...