I bought a Brand new 2018 ES 3 weeks ago with 20 miles on it, about a week ago the car developed like a flutter in the exhaust on cold start (see video link) and a sort of whine in the engine while accelerating. Took the car to the local Hyundai dealership here in south jersey to have it looked at and they claim “there’s nothing wrong with the car that they can see or hear” I’m hoping someone here can help me diagnose it as something is clearly not quite right.
Video - https://youtu.be/HhcC7G03J3o
Video - https://youtu.be/HhcC7G03J3o