Audi returns to forced induction in the 2010 S4.  The 4.2 V8 has been dropped.  The standard power train will be the new 3.0 TFSI supercharged V6 mated to quattro® all-wheel drive.  The new 3.0T is rated at 333hp and 328lb/ft of torque.  Fuel economy is significantly improved over previous generation S4.  Acceleration has also been improved too, 0-60 mph 5.1 sec (est.) Transmission choices include a 6-speed manual gearbox and a new 7-speed S tronic dual clutch transmission.  New available quattroSport rear differential dynamically varies torque between the rear wheels also known as torque vectoring.