the Audi/VW 4.2L V8 is…
December 6th, 2005...an engine that never sounds hurried or manic, with a rich, melodious growl underlying each different squeeze of throttle. Floor it in, say, third and as it swells and pulls from a few hundred low, rumbling rpm to a top-end howl it goes through a whole host of sonic stages, the most curious of which sounds something like a helicopter taking off.
source: AutoExpress