While all of our previous spy photos and videos have shown only the Avant version of the next-gen RS4, Audi has already confirmed a Sedan will also be available right away. In this latest spy footage we take another look at the more practical body style while it tackles the Nürburgring during some intense testing to make sure everything will be ready for the car’s official launch. When will that be? Most likely Audi will introduce the RS4s in 2017 since former quattro boss Heinz Hollerweger said the range-topping version will come relatively early in the production cycle.

The Ingolstadt-based marque has already announced the demise of the naturally-aspirated 4.2-liter V8 engine. Instead, the RS4 will probably use the newly developed 3.0-liter TFSI V6 that debuted in the S4 where it generates 354 horsepower (260 kilowatts) and 369 pound-feet (500 newton meters) of torque. However, the rumor mill indicates the engine will take advantage of electric turbocharging technology which should boost output to as much as 480 hp (353 kW), up by 30 hp compared to the 4.2 FSI V8.

While the bump in horsepower doesn’t seem very impressive, expect a huge improvement in terms of torque. The FSI generates 317 pound-feet (430 newton meters) at 4,000 rpm, while the V6 with in the new S4 delivers the 369 lb-ft (500 Nm) from 1,370 rpm. The RS4 will obviously have more torque than the S4 and if it will actually get e-turbo, it will be available from a lower rpm.

Besides making the switch to a more efficient and powerful engine, the RS4 will also lose some weight since it will ride on the MLB Evo platform as the A4 and S4. Like all RS models, it will come with an all-wheel-drive quattro system which is believed to receive the engine’s power from an eight-speed automatic transmission.

In terms of performance, the S4 Sedan sprints to 62 mph (100 kph) in 4.7 seconds whereas the slightly heavier S4 Avant completes the task in 4.9 seconds. The RS versions will likely be at least half a second faster and will probably be electronically capped at 155 mph (250 kph) like the S models. As seen in other RS models, we assume Audi will charge you more for a less restrictive limiter that will enable the RS4s top out at 174 mph (280 kph).

Until then, Audi is gearing up to host the world premiere on June 2 of the new A5 Coupe which has already been spotted testing in the high-powered RS5 guise.

Gallery: 2017 Audi RS4 Avant spy photo

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