The SSK ('Super Sport Kurz' — short) was developed by Ferdinand Porsche during his Mercedes-Benz years as a shorter-wheelbase, lighter and more powerful version of the S/SS sports tourer. Power came from a 7,065cc six-cylinder engine with a Roots-type supercharger that engaged under hard throttle, producing 200–250 bhp depending on tune. The SSK won the 1929 Tourist Trophy with Caracciola driving in heavy rain, and the related SSKL took the 1931 Mille Miglia. Production was tiny — approximately 33 cars (plus a handful of SSKLs).
Among the most charismatic and valuable pre-war sports cars ever built — Porsche-engineered, supercharger-howling and finite.