The standard 3.9 - liter engine features variable valve timing, which helps improve torque at low speeds and fuel economy when cruising at higher speeds. (kbb.com)
The engine's improved torque delivery is noticeable, especially in the mid-range, and the throttle gives more linear response across its travel. (automobilemag.com)
The gear ratios have been lowered by an average of 6 percent to improve acceleration, while faster - responding paddles and improved torque management have reduced shift times by 30 percent. (automobilemag.com)