For whatever it's worth - I recently noticed an unusual, brief sound when starting my car after it sat for 4 days. It has a CTS Turbo intake installed. I looked under the hood and did not notice anything out of the ordinary (it was nighttime in a not-well-lit parking lot). I proceeded to drive the car home on mostly freeway where I would typically see ~25mpg displayed on the DIS. During this drive I was seeing ~20mpg. The next morning I had another freeway drive where I would typically see ~25mpg and again realized only ~20-21 mpg. When I arrived at my destination I opened the hood and found this:
That's the original intake filter that came with my CTS Turbo intake which I ordered in March 2015 and have used on the car for less than 10k miles. There are areas of the filter that have apparently deteriorated and are now missing. I'm bringing it up publicly only because I sent an email to CTS two days ago and they have not yet responded. To me, when an air intake manufacturer has a clear defect with one of their air filters, which is a major component of their system, responding to that issue should be top priority.
Anyway - the reason I bring this is up is that if you are going to leave your aftermarket intake installed when taking the car in for service, at least do a thorough inspection of it to make sure everything is intact and connected properly. I would understand Audi issuing a TD1 for a car with aftermarket intake having holes in the filter element.
EDIT - BTW, upon discovering the issue I promptly swapped the stock intake back into the car. Fuel efficiency appears to be back to normal. Supercharger whine is nonexistent.
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