New dynamic control systems included the Electronic Stability Program (ESP), Brake Assist and the 4 wheel Electronic Traction System (4 ETS). The G 55 AMG was upgraded in 2004 with a supercharged V 8 engine developing 476 hp. In Siberia in 2006, a documentary filmmaker was the first foreigner to reach the world's coldest region with a passenger vehicle in winter, driving a stock G 500 nearly 19,000 km without a single breakdown, in temperatures as frigid as −63˚F/-53 °C.