Revealed early last year, the new 3.0 TDI Biturbo model offers a hefty 230kW and 650Nm, besting the regular 3.0 TDI and even bettering the 3.0 TFSI petrol engine.
The new model's upcoming debut has seen the 2013 A6 3.0 TDI quattro sedan's Manufacturer List Price fall to $107,500.
Similarly, the 3.0 TFSI is now priced at $114,000 MLP, dropping by $7000, and the 2.8 FSI quattro has fallen $2400 to $91,000.
Audi has also set its reversing camera as standard equipment across the A6 range, and a new Technik package is also available.
Priced at $4950, the pack offers a 360° simulated top-view camera system, LED headlights with high-beam assist, four-zone climate control and an electric glass sunroof.
As for the incoming 3.0 TDI Biturbo model, it becomes the range's new flagship model (short of the RS 6 Avant, that is), compared to the 180kW/580Nm 3.0 TDI and the 228kW 3.0 TFSI petrol model.
Matched with an eight-speed automatic transmission and Audi's quattro all-wheel-drive system, the BiTDI engine propels the A6 sedan to 100km/h in 5.1 seconds.
Fuel consumption is listed at a still-low 6.4 l/100km on the combined cycle.
As a bonus to those that prefer the aural delights of a petrol engine, Audi has also added a special sound actuator.
In Audi's words, the system "imposes a defined oscillation pattern on the exhaust flow," transforming the sound into something closer to a high-performance petrol engine.
Audi's uploaded a soundbyte of the system in action, have a listen here: