The newest generation 3 series BMW, the E90 is the current model used in the WTCC World Touring Car Championship with great success. Check out
http://bmw-motorsport.com/ for more details.

The 280 bhp BMW 320si WTCC is the racing version of the special model BMW 320si. The motorsport version of the BMW 320si is driven by a powerful 2-litre four-cylinder in-line engine. A race kit can be purchased by BMW customer teams aroudn the globe. The 320si not only competes in the FIA WTCC, but in numerous national championships as well.

This car is the youngest offspring of the successful BMW 3 Series that has been celebrating title glory in international touring car racing for several decades. BMW has now won 24 European titles. Every World Championship title to date has gone to Munich.
Currently about half way through the 2008 season BMW is placed 2nd in the Manufacturers table. Check out
http://www.fiawtcc.com/ for the latest happenings.