The Infiniti Q50 Red Sport 400. Matthew DeBord/Insider I tested a 2020 Infiniti Q50 Red Sport 400, with all-wheel-drive.The sport sedan from Nissan’s luxury brand cost $56,250 before options, which took the price to $60,475.The Q50 Red Sport’s best feature is its punchy, 400-horsepower, twin-turbocharged V6 engine.Otherwise, the Q50 has a dated interior and styling…