formula one aren't production car but I like how their engine sounds at speed of 15,000rpm. simply orgasm
link here showing a f1 engine going 20,000 rpm, simply insane.
http://www.youtube.com/watch?v=xxJ-uMLoa-4&feature=player_embedded
the rpm on this bmw , link below, had to have gone over 10,000 rpm to sound like this.
http://www.streetfire.net/video/bmw-560hp-over-10000rpm-and-much-faster-than-fe_52094.htm#disqus_thread