I define a sleeper as a car that does not look fast, and is faster than it looks. That automatically rules out sports cars (they are designed to look fast), unless you deliberately made it look slow. For example: the only kind of mustang I would think is slightly a sleeper would be a fast one that was converted to look like a slow as balls V6 mustang.

I think my car is a sleeper. 4 door Cadillac with an LS6. It looked like more of a sleeper when I had the stock silver painted wheels.



Some other good sleepers are the: Taurus SHO, Ford Festivas with turbo mazda 323 swaps, the turbo mazda 323, and the supercharged Buick regals (I think that is model).