If there's one carmaker that has the ability to milk its star product, it has to be Porsche. There are so many variants of its 911 Carrera, that it’s almost impossible to tell them apart unless you're a car nerd.

Porsche is fleshing out the 911 lineup with new all-wheel drive variants, Carrera 4S coupe and Cabriolet, plus Targa 4S.

T o say Porsche 911 variants are a dime a dozen would seem crass, both for the cliche nature of the phrase and the fact that it would take about 1.3 million dimes to pick up even