How many engines can you think of whose names are known by millions of 20-year-olds who have never touched an engine in their lives? The SR20DET version of the Nissan SR series is such an engine, having achieved pop-culture status beyond that of many movie stars. Nissan has been making the DOHC-equipped SR for more than 20 years now, and it has seen service in the Sentra, Altima, 200SX, and many other vehicles. [Wikipedia]