I know its a Subaru but it seems that when i hear high hp cars ie Evo's, Subie's, supra, and the like a lot of them have the same sounding BOV... Great video too,
http://www.autoblog.com/2009/10/16/video-vette-versus-impreza-at-the-scariest-track-day-ever
http://www.autoblog.com/2009/10/16/video-vette-versus-impreza-at-the-scariest-track-day-ever