The intake and exhaust are completely different for 2011, with the exhaust brought inboard (in the valley) and the intake moved outboard. This move was made to improve throttle response and, because the overall surface area of the exhaust system is smaller, it reduces the heat transfer to the engine compartment. Its compact size makes the heat easier to manage and also increases stiffness to reduce vibration.
Fuel delivery now comes through piezo injectors, which can deliver up to five events per cylinder, and fuel is delivered at up to 30,000 psi. Use of these injectors helped Ford engineers greatly reduce typical diesel engine noise, and this engine is noticeably quieter than its predecessor. To meet 2010 federal emissions requirements, the engine is backed by a selective catalytic reduction(SCR) system, which uses an aftertreatment of Diesel Exhaust Fluid to reduce NOx emissions. The DEF tank can be refilled by the owner (DEF is readily available), and should last about as long as regular service intervals. Ford hasn't yet released power numbers, but they are said to be "significantly higher" than the 350 horsepower and 650 pound-feet of torque of the outgoing model. Fuel efficiency is said to be better as well. The 6.7 is capable of running on B20.
On the gas-powered side, buyers will have a choice of the 6.8-liter V-10 (at least for now), and an all-new 6.2-liter V-8. This 6.2 replaces the three-valve, 5.4-liter V-8. We don't know horsepower and torque numbers yet, but in the Raptor it's supposed to put out an estimated 400 horsepower (as opposed to the 5.4's 300), an estimated 400 pound-feet of torque (compared with 365 in the outgoing 5.4), and is said to provide better fuel economy.
The SOHC V-8 uses roller-rocker shafts, variable cam timing, two spark plugs per cylinder, dual knock sensors, and more efficient airflow. The 6.2 and 6.7 will be backed a new 6R140 six-speed TorqShift transmission. The new transmission helps improve fuel economy and provides a new option: live drive PTO. You can use the PTO when the engine is running as a source of auxiliary power. There's also an integrated exhaust brake.