The Maserati Quattroporte V was developed while Ferrari owned the company, under the guidance of Enzo The Second, Luca Cordero Di Montezemolo. It used a Ferrari-built V-8 whose sound was, thanks to a 2008 study, scientifically proven to increase sexual arousal. This is just the beginning of its appeal — though the Quattroporte wasn't a home-run at first. Thanks to the Ferrari influence, it used a single-clutch automated manual transaxle called "DuoSelect." Automated manuals were, mercifully, a short-lived fad in sports cars, and in heavy luxury sedans, they worked even less well. Drive a Quattroporte 12,000 miles per year and you're looking at $500 per month just in clutch wear. Luckily, after FIAT took control of Maserati away from Ferrari, it reengineered a huge portion of the car to fit a conventional 6-speed automatic. And the Automatica then gave the fifth-generation Quattroporte a chance at being the best-driving full-size luxury sports sedan of all time. Which it became.