The S4 is based on the A4 platform.
This high-performance AWD sedan is powered by a 349-hp, 3.0-liter turbo V6 mated to an eight-speed automatic, the same powertrain that is on the S5.
Advanced safety and infotainment systems are all up to date.
The S4 has been very impressive on a track, particularly in sport mode.
It employs a system that splits torque from the front to rear and side to side to improve handling.
The interior is well-finished and nicely appointed, with comfortable and supportive leather sport seats.