With the Audi RS5, Senner Tuning took all the usual steps: some exterior appointments, upgraded suspension and of course, more power. Starting with the engine modifications, the 4.2-liter direct-injected V8’s output was boosted to 506 hp (+56 ponies) and 478 Nm or (353 lb-ft (+48Nm or 36 lb-ft), by letting it “breathe” more efficiently through a new, valve-controlled stainless steel exhaust system. Thanks to these changes, the modified RS5 accelerates from standstill to 100 km/h (62 mph) in 4.2 seconds, or almost half a second faster than the stock model.

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At this year's Paris Auto Show in October, Audi celebrated the original 1980s Quattro's 30th anniversary by unveiling the Quattro Concept. Soon after, rumors started flowing around that Audi plans to develop a production version of the sports car, which is loosely based on the RS5 Coupe's architecture using a modified version of the RS3 Sportback / TT RS' 2.5-liter turbocharged inline-five with 408 ponies.

Even though we've yet receive any official confirmation on the production model, the German automaker continues to release new material on the Quattro concept. This time, the Ingolstadt firm has published a new promotional film showcasing the design study as well as its spiritual predecessor, the 1984 Quattro Coupe. Watch the video right after the break.

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If you thought we'd had enough of 'malignant rumors' with our last article reporting that Jaguar was seriously considering putting the C-X75 hypercar into limited production, you were wrong.

British magazine Autocar reports that a team of engineers at Audi's Ingolstadt headquarters are advancing plans to put the Quattro Concept from the 2010 Paris Motor Show into limited production. If approved, this would see the nouvea-Quattro being built in limited numbers at ItalDesign's plant near Milan.

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Interested in seeing vids of the new 'anniversarious' Audi quattro concept? You know you are, and we aim to please. As a brief recap, you should know that this RS5-based concept is powered by a 408-horsepower inline-five displacing 2.5 liters that spins all four wheels through a 6-speed stick.

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Audi has finally revealed its 'quattro concept' in Paris to celebrate the 30th anniversary of the original car's 1980 debut. The new quattro, much like the original, gets driven around the rally stages of your dreams by a turbocharged 5-cylinder.

In this case, though, the 2.5-liter unit makes 408-horsepower / 300 kW and uses a 6-speed manual transmission to drive all four 20-inch wheels with 480 Nm / 354 lb-ft. Behind the center-locking dubs are carbon-ceramic discs wearing 6-piston grippers.

With its high-output 5-pot and diet, the new quattro is said to be able to spring to 100 km/h / 62 mph in a scant 3.9 seconds and return a fuel economy of 8.5 liters/100 km (27.67 mpg US).

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In one of its more 'lighter' tuning proposals, MTM has released details on its new line of performance upgrades for the Audi RS5 coupe. Instead of fiddling around with the RS5's 450HP V8 engine to increase the car's top speed, the German tuning simply reprograms the factory electronic speed limiter of 250km/h or 280 km/h, allowing the coupe to reach a maximum velocity of 303 km/h or 188mph. The cost for the removal of the speed limiter is a hefty €1,499 or a little over US$1,900 at today's exchange rates.

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Last time we checked (as in a few minutes ago on the UK, US and German sites), the S5 Coupe continues to use Audi's venerable 4.2-liter V8 with 354HP, while the S5 Convertible comes with a 333HP 3.0-liter supercharged V6. Nevertheless, APS, the UK-based importer of the Swiss tuning brand Sportec, has released a performance upgrade for the S5 Coupe and Convertible with the... 3.0 TSI V6.

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