Nissan's unassuming front-drive Sentra sedan spawns two distinctively higher-profile go-fast variations on the base car, both focused on value-oriented enthusiasts who require the practicality of four doors. The naturally aspirated 2.5-liter engine in the hot SE-R makes 177 horsepower and gets paired with a continuously variable automatic transmission (CVT) that can be upgraded with paddle-shifters and emulates six conventional gears in Sport mode. Step up to the hotter Spec-V and the front wheels are driven by a 200-horse variation of the 2.5L backed by a close-ratio six-speed manual. To help cope with that extra muscle, the Spec-V also nets tauter chassis tuning, bigger brakes, various body reinforcements, grippier tires and offers an optional helical limited-slip differential. Other items on the well-appointed SE-R and Spec-V's very minimal list of extras include a GPS navigation system with XM Real-Time Traffic and a 340-watt Rockford Fosgate premium audio package.