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This is primarily used to cap off where the sound pipe connects to the intake after removal on a Mk5 FSI or Mk6 TSI GTI. The ID tolerance is slightly smaller than the actual pipe to ensure a good seal from boost leaks.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.