Porsche will announce the latest evolution of its iconic 911 sports car, the GT3, at the 2009 Geneva Motor Show. The proven six-cylinder naturally aspirated power unit now develops a maximum output of 435 hp (320 kW), up 20 hp over its predecessor. For the first time, the 911 GT3 comes with a sports version of Porsche Stability Management (PSM), offering the facility to deactivate both Stability Control (SC) and Traction Control (TC) in separate steps.