For the Super2000 regulation (WTCC) of 2006, BMW developed the 320si, based on the E90 3-series sedan. The engine was a 1999cc inline 4 cylinder and 275 horsepower at 8300 rpm. The car was also used in the European series (ETCC). In the world championship, BMW took the first two places in the drivers 'standings with Priaulx and Mueller, also winning the constructors' title.