This book chronicles the evolution and impact of Porsche's air-cooled turbocharged engines in their iconic 911 models from 1974 to 1996. Author John Tipler details the progression from racing technology to production cars, beginning with the 934 and 935 race cars that led to the 1974 Type 930. The narrative follows the success of the 930, its sales figures, and its successors, the 964 Turbo and 993 Turbo, highlighting the technological advancements and market presence of these performance vehicles.

The book is presented as a comprehensive historical account for automotive enthusiasts, focusing on a specific and celebrated era of Porsche's engineering prowess. The inclusion of interviews with racing and automotive personalities, alongside detailed specifications and photography, suggests a work aimed at providing both technical depth and engaging narrative for fans of the marque. The foreword by Alois Ruf further lends an air of authority and insider perspective to the publication. It is positioned as a valuable resource for understanding the development and legacy of Porsche's air-cooled turbo models.