Click above for a high-res gallery of the Audi RS5 undergoing testing

Audi's RS engines have never failed to deliver aurally. They don't even require you to wring them out -- just turn them on, and your ears and body cavities tingle with the sound and resonance. The Audi RS5 will continue that tradition admirably, if this video of it running The 'Ring is any indication. Based on that note, unless they've tweaked the exhaust from the 4.2-liter V8, it sounds to us like there's a certain V10 lurking in that engine bay. And if that's the case, this car has just made the number one slot on our Every Day Audi wish list. Follow the jump for the symphony. Thanks for the tip, Mike!

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