He picked up the concept again after moving to Audi, because there was a market demand for engines with more than 4 cylinders. At the time, Audi (and the Audi-derived VW Passat/Santana model range) used longitudinally mounted inline engines and front wheel drive. More conservative layouts with 6 cylinders were rejected because of engineering and production costs (V6 engine) or packaging requirements (straight 6 did not fit because front wheel drive required that it be mounted in front of the axle).