Which Car Makes The Best Noise: The New BMW M3, Or An Audi RS4?

With the latest F80 BMW M3 and a B8 Audi RS4 at our disposal (full feature coming soon!), we couldn't resist having a sound-off. Which car gets your vote, the 3.0-litre twin-turbo straight-six BMW, or the N/A 4.2-litre V8 Audi?