Hahne was successful in touring car racing, including the European Touring Car Championship. In 1966, he raced a BMW New Class 2000TI. In the six-hour "Großer Preis der Tourenwagen" on 3 July 1966, an Alfa Romeo GTA had lowered the Nürburgring touring car race lap record to 10:08.9. A month later, in a support race for the 1966 German Grand Prix, Hahne was the first to lap the Nürburgring in under 10 minutes in a touring car, in 9:58.5.