Certain vehicles will require a small breather filter to go with their intakes. If you have a Secondary Air Injection (SAI) hose, this will be a required accessory. Check out the handy image to see where the SAI is, and if you have it.
AWE Tuning S-FLO Breather Filter VW/Audi 2.0T
AWE Breather Filter
Breather Filter
