Interesting first drive review here of the Audi A6 Avant TDI.
Audi just made the executive-wagon segment a lot more interesting, with a twin-turbocharged variation of its 3.0-liter TDI turning out 313 hp and an even more impressive 479 lb-ft of torque. Not only is it a powerful mill, but this diesel has attitude. Many oil-burners are impressive in their power delivery and massive torque, but lack soul. The 3.0-liter TDI, on the other hand, fires up with an impressive growl, and the sound gets better as you push it through the gears. Its voice is reminiscent of an old-fashioned V-8’s, a sound that is clearly audible inside and out. Think we’re crazy? Just wait until you hear how Audi did it: The company stuffed an extremely durable speaker into the exhaust system that allows it to alter the engine note. It can even be adjusted on the move.