So I have a 14 veloster turbo, yesterday when I was driving to work and would accelerate instead of getting the standard air release sound from my CAI I was getting a flutter sound when releasing accelerator. Even if I was shifting at 2000 or 4 or 5000 rpm I would get the flutter sound. When driving home from work I had the same noise for about 3 mins and then the engine light came on and the noise went away. Couldn't simulate it today either. Anyone have any ideas? I called the dealerships and none of them have heard this issue before. It has a CAI no tune or other mods.