ultimate Audi I5 crankcase breather vent adatper
To help address this issue, INA Engineering has come up with a nicely engineered 2 piece cranckcase breather 'puck' that replaces the factory tin breather port with provisions for packing with stainless wool to both allow large volumes of air, but critically low volumes of OIL from escaping. sold without fittings. can be setup for AN flare or a barb fitting depending on how you want to setup the rest of your PCV system. the bottom drain fitting is M14x1.5, the top fitting is threaded for AN12.
note that there is a small difference in opening size between i5 blocks, some motors may require a good 2 part epoxy to seal the unit to the engine.