My 2007 Vue has started to sound like a muscle car when I accelerate and maintain speeds over 20 mph. The RPMs are appropriate, there are no idiot lights on, and the battery appears to be behaving as usual. Also, the dash and radio lights dim and/or blink out intermittently. Help?
Um, perhaps the muffler is shot? Or the exhaust has a rot hole?
The dash and radio lights dimming intermittently suggest you might also have a bad alternator causing erratic voltage. Fortunately, any shop can check this.
Make sure your battery connections are clean. As far as the noise, you can search under the hood and under the car for a crack or hole.