With the Audi RS5 officially revealed, engineers from Ingolstadt are now preparing the all-new RS4 Avant. Based on the B9 generation of the A4 Avant, it will continue the marque's tradition of producing high-performance station wagons.

Spied: Audi RS4 Avant undergoes further testing

Even with the standard A4 Avant out in the market already, Audi still put the covers on their hot wagon. The covers on the fenders suggest that the car will have a wider stance and track to accommodate its unique suspension set-up. Expect larger air intakes at the front and a honeycomb finish grill, just like in the RS5.

Side profile of the Audi RS4 Avant prototype

The rear quarter panel has also been covered, likely because these have been widened as well. Like the front, it is likely the rear gets a different suspension set-up from the non-RS A4 Avant models. Meanwhile, the disguise on the tail lights hint that these units have slightly been tweaked for the RS. The rear bumper is also different, sporting a more aggressive look.

Rear quarter of the Audi RS4 Avant prototype

According to our spies, the next-generation RS4 Avant will no longer be powered by a naturally-aspirated V8 engine. Instead, it will use a 2.9-liter, twin-turbo V6 engine based on the one found in the Porsche Panamera 4S. This very engine is also seeing service in the Audi RS5 and it is possible that it will get the same power output. Horsepower is rated at 450 PS while torque is at 600 Nm. Quattro all-wheel drive is standard.