SOME competitiors will tell you that you need to run a PCV Basket under this item, however FORD NEVER DID!!, as the Vent isn't pressurized or running with Vacuum. All it does is equalize the engine with ambient pressure on RACE DAY! some of the words in their description . I think you should run some type of breather material in the tube if you are pulling outside air into your engine through this tube . I put house ac foam in the tube on my engine , maybe not needed , but it makes me feel better .
