This is a Triumph Dolomite Sprint. It has a two-liter fourbanger like most boring small family cars. And it has no business sounding as good as it does.
Maybe it's some special exhaust set up (this is a rally-prepped car after all), but even then a sound this fantastic shouldn't be coming from an ordinary-looking car.
(Hat tip to Biturbo288!)
A Four-Cylinder Family Sedan Shouldn't Sound This Good