Not that the Audi S5 isn't fastest enough, but another 100 horsepower or so might make it the best coupe on the planet. Looks like we'll get our wish soon enough as spy photographers caught what looks to be an Audi RS5 testing in Death Valley.

© Source: edmunds

The placement of the fuel filler cap will also be changed due to the missing rear pillars, while changes under the sheetmetal will likely include extra chassis strengthening. While the base model will likely stick with the hard-top’s 420hp (313kW) 4.2L V8 engine, there’s talk that 
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