Strenger 914-6 GT This rare M471 optioned 914-6 was used by Porsche as a presentation car and as a camera car at the Nurburgring in Germany. Owned by Erich Strenger, Porsches graphic artist who designed the Porsche crest, 356 sales brochures, Porsche racing success posters from 1951-1978 and was cofounder of Christophorus magazine.