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Video: 2014 Mercedes C63 AMG 507, 2014 Audi RS 5 Go Head 2 Head

Motor Trend logo Motor Trend 2/27/2014 Jason Udy

With the ever-escalating horsepower wars -- and tightening emissions regulations -- the naturally aspirated German V-8 won't be around much longer. On this episode of Head 2 Head, Jonny Lieberman compares two of the last all-motor German coupes: the 2014 Mercedes-Benz C63 AMG 507 Coupe and 2014 Audi RS 5 coupe.

With a 6.2-liter V-8 under the hood, the Mercedes C63 AMG 507 pumps out 507 hp and 450 lb-ft of torque, while the Audi RS 5 's 4.2-liter V-8 makes 450 hp and 317 lb-ft. Both engines are mated to a seven-speed transmission: the C63 AMG uses an automatic, while the RS 5 features a dual-clutch gearbox. While the Mercedes sends power to the rear wheels, the Audi sends its power to all four wheels.

2014-Audi-RS5-Mercedes-Benz-C63-AMG-507-Coupe-on-Head-2-Head1© Provided by MotorTrend 2014-Audi-RS5-Mercedes-Benz-C63-AMG-507-Coupe-on-Head-2-Head1

At the track, both cars returned similar acceleration times. With a 0-60 mph time of 3.8 seconds and a quarter-mile time of 12.2 seconds at 117.4 mph, the C63 AMG edges out the RS 5 by 0.1 seconds in both measures and finishes the quarter-mile 5.2 mph faster. The C63 AMG also stopped from 60 mph in 103 feet -- a foot sooner than the Audi. While the C63 AMG was quicker in acceleration tests, the RS 5 shined in the handling tests, posting 0.99 g around the skidpad compared to the Mercedes' 0.91 g. Around the figure-eight, the Audi posted a 24.6-second lap at 0.84 g compared to the C63 AMG's 25.2-second lap at 0.78 g.

After wrapping up the performance tests, Lieberman takes the 2014 Mercedes-Benz C63 AMG 507 Coupe and 2014 Audi RS5 coupe on some canyon roads to see which car he would rather own. In the canyons, the host has to contend with rain and wet roads. So, which German coupe would he rather own? Check out the video above to find out.


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