Few sedans are as alluring as the Aston Martin Rapide S (astonmartin.com), and considering the car’s looks, agility, and speed, it is no wonder that the company’s designers insist on calling it a four-door sports car instead of a sedan. The new model has received a significant performance boost over the original, which was launched in 2013. The new 8-?speed automatic transmission provides crisp, perfectly timed shifts and is paired with a retuned 5.9-liter V-12 that produces slightly more power than it did …