Much like the Spanish Inquisition, a sleeper car is one that nobody expects. It’s ruthlessly fast, powerful, and efficient, with all the mechanical capabilities of a hardcore sports car — and none of the persona. Sleepers occupy the sidelines, hiding their high performance under unremarkable exteriors, content to let garish sports cars attract all the police attention.
For as long as drivers have souped up their cars, the sleeper has been the unassuming badass in the background; naturally, manufacturers caught on, and every so often, some pretty amazing ones take to the streets straight from the dealership floor.
http://mysupercars.us/10-basic-cars-...-fast-as-hell/