http://www.audi-journals.de/eJournals/mz3/default/index_4ringe_en.html Read this one in 6/2011 Hemmings Sports & Exotic Car . the link in the magazine was a bit off, but I found the book at the link above. The article indicated that it is possible to download the content, but it did not appear to me to be possible. Steve Buchholz