The seductive five-door A7 assumes its flagship status by adding the RS 7 model, sporting a turbocharged 4.0L V8 that delivers a mere 560 horses and 516 lbs.-ft. of twist. For 2015, the rest of the line-up benefits from styling tweaks, be it the 3.0 T (310-hp supercharged 3.0L V6), the thrifty TDI (240-hp 3.0L turbodiesel V6) or the sporty S7 (420-hp 4.2L V8). All A7s share the quattro system and automatic gearboxes with seven or eight cogs.