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For the last few years, Audi has been publicly toying with building a successor to its Ur-Quattro, a model still glowing in a gritty patina of motorsports glory decades after it left the scene. If anything, the rally car's halo has burned brighter as Audi has matured into a world luxury superpower. Since 2010, the German automaker has shown two different concept cars that attempted to re-bottle the legend's lightning, and it's still trying to figure out whether to market a production model. Despite that conundrum (and not to take anything away from the seminal Ur-Quattro), it's easy to argue that there are two other cars much more important to Audi's rise from its '80s ashes: the original TT and the B5-generation A4 and its high-performance variants.
The TT thrust Audi into the vanguard of automotive styling while firmly establishing the Volkswagen Group as masters of platform development (the same basic architecture and powertrain guts were employed in a dizzying array of models, from the Golf, Jetta and New Beetle to a number of Škoda products). This unprecedented, flexible building-block approach to new model development has since become the standard of the industry.
In the case of its B5 cars, the A4, S4 and RS4 put Audi back on the radar of rival German automakers, and more importantly, they grew the Four Rings' sales by leaps and bounds while reminding the world that all-wheel drive needn't only benefit hardcore performance cars and utility vehicles. Fast-forward to today, and the A4 has established itself as the bedrock of Audi's lineup, but it's also grown over its four generations to become substantially larger, heavier and costlier than the model that debuted back in 1996 America. That's created a vacuum at the bottom of the range that the company has inadequately addressed - until now.

Audi stealthily tests RS4 Avant

With S3s, R8s and RS7s aplenty, Audi offers no shortage of performance models in North America. But one of our favorites is always kept just out of arm's reach. That of course is the RS4 Avant, and here we see Audi Quattro GmbH testing the latest version. Though it may look like a plain old S4 – and even wear S4 badges – the wider fenders and bigger wheels suggest that this is in fact a prototype for the upcoming RS4 Avant. For those unfamiliar, that nameplate connotes the best of all worlds within the A4 range: maximum power, maximum traction, and maximum luggage space. All the ingredients, in short, to make us wonder why anyone would rather drive a crossover. After the first-gen RS4 employed a twin-turbo V6, the subsequent two generations went with a 4.2-liter V8. This model, however, could adopt an electric turbocharger setup to give it all the power it needs (and then some) with a new form of hybrid setup that will soon be spreading across the industry. The bigger question on our mind, of course, is whether the new performance wagon will make the transatlantic voyage to North American showrooms. We're holding out hope that Ingolstadt may make a real run down American roads at the likes of the Mercedes-AMG C63 and BMW M3. Whether it brings the wagon body-style along with it is another matter entirely, but we can always dream. Related Video:

Porsche, Audi team up for tech: autonomy, EVs, hybrids and more

Porsche and Audi have been working on a number of important technologies for future vehicles. The two luxury automakers, both part of the Volkswagen Group, have mostly appeared to guard the space between their brands despite some shared engines and a platform. While their goals may not always overlap – Porsche has shied away from fully autonomous driving, for instance ­– the two brands have decided they could move more quickly into their respective futures by putting their heads together. In that spirit, Audi and Porsche are partnering up for a "shared vehicle architecture strategy of the future." This collaboration will focus on future mobility, including the development electrification, digitization, and autonomous driving technology. And the teams have knowledge and resources to share with one another. Porsche is moving fast with electrification, adding more hybrid systems to its models and preparing to launch the ultra-fast-charging Mission E electric car. Audi has been pursuing autonomous driving, connected vehicle and V2X tech, and Shared Fleet programs. Combining the best and brightest of both companies should help accelerate R&D. Even if one or the other company doesn't put all of the co-developed technologies into its vehicles, they'll both be learning the lessons, and sharing resources should help keep costs in check. "We will cooperate wherever it makes sense," says Porsche Board of Management Chairman Oliver Blume. "But we will also be very careful to maintain the differentiation between our brands. A Porsche is always a Porsche, and that will remain so in the future." Detail are still scarce, but Audi and Porsche will pin down a more a more specific sharing strategy as they develop their plan through 2025. While the cars continue to look and drive differently, expect Porsche and Audi to share more components and digital capabilities moving forward. Related Video: