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Bohn, who made some costly miscalculations that led to his dismissal soon after, along with that of the development director, Dr. Ulrich Bez, who was formerly responsible for BMW's Z1 model, and today is CEO of Aston Martin.
In 1990, Porsche drew up a memorandum of understanding with Toyota to learn and benefit from Japanese production methods. Currently Toyota is assisting Porsche with hybrid technology, rumoured to be making its way into a Hybrid Cayenne SUV and, announced for the 2011 model four-door coupé, the Porsche Panamera.
Following the dismissal of Bohn, an interim CEO was appointed, longtime Porsche employee, Heinz Branitzki, who served in that position until Dr. Wendelin Wiedeking became CEO in 1993. Wiedeking took over the chairmanship of the board at a time when Porsche appeared vulnerable to a takeover by a larger company. During his long tenure, Wiedeking has transformed Porsche into a very efficient and profitable company.
Ferdinand Porsche's grandson, Ferdinand Piëch, was chairman and CEO of the Volkswagen Group from 1993 to 2002. Today he is chairman of the Supervisory Board. With 12.8 percent of the Porsche voting shares, he also remains the second largest individual shareholder of Porsche AG after his cousin, F. A. Porsche, (13.6 percent).
Porsche's 2002 introduction of the Cayenne also marked the unveiling of a new production facility in Leipzig, Saxony, which once accounted for nearly half of Porsche's annual output. The Cayenne Turbo S has the third most powerful
production engine in Porsche's history, with the most powerful belonging to the Carrera GT (605 hp) and the second being the 997 GT2 (530 hp). The 500 hp of the Cayenne Turbo S matches the "997 II" Turbo's output.
In 2004, production of the 456 kilowatts (620 PS; 612 bhp) Carrera GT commenced in Leipzig, and at EUR 450,000 ($440,000 in the United States) it was the most expensive production model Porsche ever built.
As of 2005, the extended Porsche and Piëch families controlled all of Porsche AG's voting shares. In early October 2005 the company announced acquisition of an 18.53% stake in Volkswagen AG (VW AG), and disclosed intentions to acquire additional VW AG shares in the future. As of June 2006, the Porsche AG stake in VW AG had risen to 25.1%, giving Porsche a blocking minority, whereby