Car, BMW X6 ActiveHybrid 2010, BMW hybrid car. In late 2009, BMW introduced an X6 featuring a version of the Global Hybrid Cooperation hybrid power train, popularly known as the two-mode hybrid system. This car was confirmed as being called the BMW ActiveHybrid X6, and it is the world's most powerful hybrid car as it went on sale. The car was be launched alongside a 7-series hybrid at the 2009 Frankfurt Auto Show.