Ok, so Ive had my MY17 TTS about 2 months and this is something I noticed immediately in comparison to my old S3. When the car is in Dynamic mode and the Gearbox is in "S", if the revs are medium to high and I let off the the throttle the car makes a strange metallic crackling noise that's very hard to pin point. Its not overly loud but you can hear it when you know what to listen for. The car is standard and and has no modifications. any ideas?