Sleeper cars don’t look impressive on the outside, but they are filled to the brim with power on the inside. They might not be worth the extra work though.
Car enthusiasts love modifying cars and there are a certain group of those car enthusiasts that like to go under the radar and create sleeper builds. Sleeper cars are unassuming on the outside but can bring a lot of power. Imagine a minivan or a station wagon which can keep up with supercars. Sleepers are very fun builds, and the reaction of others are always worth the extra effort to make your vehicle fly under the radar and not shout that it has a thousand bhp under the hood.
While there are many positives to owning a sleeper car, it might not be as cool as it seems. With experience in modifying cars, building them for the racetrack, rally racing, and lots of personal projects as well, I can say that sleeper cars might not be as cool as they seem to be on paper. The fault lies in the mere definition of it. A sleeper car is unassuming so nobody will actually know what they are looking at. Then comes the whole ordeal of proving that what you are saying is actually legit.
