Launched way back in 1964 and still in production today, the Porsche 911 has become an automotive wonder of the world. Down the years it has continually evolved, to the point where today's versions share little more than a name, a shape and an engine configuration with their earliest forebears. The many thousands of changes in specification through the years are all recorded and explained in this book, which has been compiled with extraordinary diligence from technical documentation in Porsche's archives.