19. Infiniti M45 (Y34)
The Infiniti M45 (Y34) is a true underdog in the luxury sedan world. Its understated, almost anonymous exterior hid a robust V8 engine that delivered serious performance. Often overlooked compared to its flashier rivals, the M45 offered a satisfying blend of stealth and speed. MotorTrend commended the M45 for its sleeper appeal and refined power.