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Spy video shows Audi RS4 Avant twin-turbo V6 lapping the Nurburgring

Nurburgring testing season is in full swing, and Audi took some of its newest upcoming models for a spin. That means our first listen to Ingolstadt's new, turbocharged RS engine under the hood of the RS4. Based off the updated A4, the new RS4 Avant is a return to the performance variant's roots. The original RS4 (and early versions of the S4) used twin-turbo V6 power, although more recent models stuffed the beloved 4.2-liter V8 under the hood. The turbo engine in the new model is also rumored to find its way into the back of the R8 supercar. We don't know horsepower figures yet, but with 450 horsepower as the benchmark from the last RS4 we expect big numbers from the six-cylinder. The new engine might be just as powerful as the old V8, but as you'll see in the video, it's missing the phenomenal growl that the 4.2-liter made as it revved to the sky. This new car is quiet, especially compared to the ear-tingling five-cylinder note of the TT RS testing alongside the wagon. A quiet performance car is fine if you like stealth, but with its flared wheel arches, oval exhausts, and big wheels, the RS4 is a car that's anything but subtle. Related Video: News Source: Car Spy News via YouTube Spy Photos Audi Wagon Luxury Performance Videos

Munich prosecutors expand Audi investigation

Munich prosecutors said they have widened an investigation at Audi to examine the carmaker's sales in Germany and elsewhere in Europe after the federal government accused the Volkswagen division of cheating on emissions tests in its home market. Audi on Thursday recalled around 24,000 older A7 and A8 models in Europe, 14,000 of which were sold in Germany, to update transmission software, which it said was causing nitrogen oxide (NOx) emissions to exceed EU limits. Munich prosecutors have been investigating Audi on suspicion of fraud and criminal advertising in the United States where parent Volkswagen's emissions scandal broke in September 2015. They have expanded the inquiry to include vehicle sales in the brand's home region, a spokesman for prosecutors said. Audi said late on Thursday that it would continue to fully cooperate with authorities and Germany's KBA motor vehicle authority, which the carmaker had notified about the latest emissions irregularities. The affected Audi models with so-called Euro-5 emission standards, and built between 2009 and 2013, emit about twice the legal NOx limits when the steering wheel is turned more than 15 degrees, the German transport ministry said. Prosecutors said the suspicion in the Audi investigation still centered on fraud, adding they have not yet received updated information from the KBA on the situation in Germany. Their investigation came to a head in March when prosecutors searched Audi's headquarters in Ingolstadt in connection with the emissions scandal, as well as a second German plant and subsequently even the law firm that VW had hired to clear up dieselgate.Related Video: Government/Legal Green Audi Emissions volkswagen diesel

Audi testing long-tail version of R18 e-tron quattro for Le Mans

Race teams are always looking for ways to shave hundredths of seconds of their lap times. Case in point: Audi is making some slight changes to its prototype racecar to make it ever so much more slippery as it cuts through the air.
Debuting at the second round of the FIA World Endurance Championship at Spa on May 4, Audi will be testing a long-tail version of its R18 E-tron Quattro racecar. As its name suggests, the long-tail car gets a lengthened rear section with the goal of improving aerodynamics. The long-tail will be run alongside the standard version of the racecar as a testbed for possible changes that might be in store, heading into the 24 Hours of Le Mans.
Audi did not say how many inches were added to the racecar, but as you can see in the image above, "long-tail" definitely doesn't take on the same meaning of classic long-tail cars of the past such as the Porsche 917. More information about the car, Audi's team and even some info about the track itself can be found below.