I have a 2014 mr with about 7000 km. Bone stock, no tunes. I started getting a vibration, almost like a flutter at about 2500 to 3500 rpm. It's not turbo flutter, it occurs when coasting or under light throttle pressure. It used to only happen for the 1st few minutes of driving until everything warmed up. I just got back from a good highway drive and now it doesn't go away, and it's starting to get louder. The frequency of the vibration is directly proportionate to the rpms of the engine. Under heavy acceleration it goes away.

Does anyone know what's going on?

Other than the noise, everything is operating normally.

 

I have 14 mr too w 10k miles stock. Not experienced such issue. Check all you clamps and hoses are tight.

 

your obviously under warranty just take it in!