450 hp at 9000 rpm? Wow! I can imagine the sound of the 8 cylinder engine at 9000 rpm. Even the new m5 makes 8250 rpm. It would be a monster if it makes that much revolution.The RS4 from the pictures is equipted with a 425hp 'non-turbo' 4.2 V8 FSI engine. They are also testing a version that produces 450hp @ 9000 Rpm.