I have a 2013 V6 and I have a whistling noise when accelerating. Although I describe it more as a chirping or high-pitched whirring. It happens when accelerating, lessens or goes away when I let off gas. Push he pedal, it's back. Mine is exactly as you describe as far as barely noticeable with radio on. I hate it because I can't have a "quiet drive" with radio off or else the noise drives me crazy. Dealership said they couldn't find a problem and all noises are "normal". Very unhappy but not worth it to go back to the dealership. I'm looking for info as to whether or not it could be fixed with any modifications. They comment above regarding the plastic intake is making me think maybe some mods would fix the issue? I don't know....
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