Porsche will release the new 911 at Geneva. Porsche says the 911 turbo sports car is its most powerful production 911 to date. The sixth-generation of the range-topping 911 model accelerates from 0-100kph in 3.9 seconds. Its 480hp, 3.6-liter boxer engine has 60hp more than its predecessor. The car goes on sale in the US starting July 8. The US price is $122,900. At Geneva, Porsche also will release details of its latest 911 GT3, which it calls is a “race car for the road.” The GT3 gets the styling and cockpit of the latest 911.