16. Cadillac CTS-V Wagon
The Cadillac CTS-V Wagon is not only a sleeper due to its supercharged 6.2-liter V8 producing 556 horsepower but also one of the rarest American performance wagons ever made. With fewer than 1,800 units produced between 2011 and 2015—and only about 514 equipped with the coveted six-speed manual transmission—it occupies a unique niche as a family hauler that can out-accelerate many supercars. This combination of rarity, practicality, and blistering speed has cemented its status as a modern collector’s dream and a true sleeper legend.