"Porsche, which makes its home in Stuttgart, Germany, came out as the top automaker in the annual quality survey, while the Mercedes-Benz plant in Sindelfingen just outside of Stuttgart was named the top assembly plant. Porsche's Stuttgart plant, where the 911 cabriolet and coupe are built, came away with a "Silver" award as one of the best assembly plants in Europe, just ahead of BMW's Regensburg assembly plant."