 Complete the following phrase:  In the 1960s, the Formula One German Grand Prix was often held concurrently with a Formula Two race on the same circuit, allowing BMW F2 cars to take part. In 1967, BMW entered Hubert Hahne in a Lola F2 chassis powered by an enlarged BMW engine which meant that it conformed with the Formula One regulations, while David Hobbs was entered by Lola in the same combination with the standard smaller BMW engine. For the 