The underbonnet insulation only last 4-5yrs before its starts to sag and eventually starts falling apart. They have revised the Mk6 insulation once or twice and the later one has a section of silver heat foil in one area of the insulation.
Most people simply remove them once they start falling apart, but it can obviously be replaced if you wish to.
Try getting in touch with VAGParts in Sydney who will be able to source you one for cheaper than the VW dealer.
5K0-863-831-G is the part number. They retail for approx $170 USD so expect to pay $250-280AUD for a genuine one, although a quick Google shows there are plenty of Chinese copies available for about $50-70AUD.
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