The five-door S3 will debut in December with a price tag between $65-70,000, the carmaker has confirmed, while the RS 6 will enter in November at around $230,000.
For the S3, its expected price range puts the performer within cooee of Mercedes' 265kW A 45 AMG, which will land in September at $74,900.
"We intend to add even more value to the package,” Audi Australia's Andrew Doyle said.
“It’s a highly competitive market place and we want the many Audi customers, both existing and new, to be delighted with their brand new S3 Sportback.”
Power in the S3 is provided by a 221kW/380Nm 2.0 litre four-cylinder turbo engine, putting the new wagonette well ahead of its 195kW/350Nm predecessor.
Australian buyers will have the choice of either a six-speed manual transmission or the familiar six-speed S tronic dual-clutch auto.
The RS 6 Avant will join Audi's existing range of RS models in November, including its smaller wagon sibling, the RS 4 Avant.
The powerhaus wagon is driven by Audi's 4.0 litre twin-turbo TFSI V8, producing a huge 412kW and 700Nm - matching BMW's 4.4 litre V8 M5 on power and adding 20Nm of extra torque.
Matched with all-wheel-drive and an eight-speed auto, Audi promises the potent V8 will push the big wagon to 100km/h in 3.9 seconds - again bettering the 4.3-second M5.
“Without a doubt, 2013 is a year when Audi will introduce a host of extreme performance vehicles to the Australian market," Doyle said.
"In addition to our RS 4 Avant, TT RS plus and R8, we will also be bringing the new RS 5 Cabriolet in July.”
The previous V10-powered RS 6 Avant was sold in Australia between late 2008 until 2010. Around 65 units were sold in just over two years.
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