I'm not sure if driving your car at 4000 - 6500 rpm is such a great idea. The engines in these Aveos are far from performance engines. I have a 2009 Aveo5 with the manuel trans. I rarely allow the rpms to drift above 3500 rpms. I believe if you run your engine at 94000 to 6500 rpms you are going to begin to hear more than a ringing noise. Your engine is telling you to back those rpms way down. I believe if you treat your car well, it will treat you well.