Sleeper cars hide performance behind an unassuming face. They don’t shout with wings and wide tires. They let the numbers do the talking. Today, one of the most surprising contenders for the title of ...

Beware the quiet ones: Volvo's most powerful new sleeper hit packs a punch that will leave you breathless.

In fact, what is a sleeper car? In the motoring world, a sleeper is a vehicle that hides its performance potential from the ...