In 2009, Hohenester Sport announced its modified HS 650 Audi B7 A4 quattro had set a new world speed record of the fastest biogas-powered car of 364.6 km/h (226.6 mph) at the test track in cardboard castle, Niedersachsen, driven by Jürgen Hohenester. The vehicle includes a 3.0 litre twin-turbo V6 engine, with electronically limited 700 PS (515 kW; 690 bhp) rating.
