PCV is 5/8" but intake is 3/4". The factory hose has 2 different ends on it. I picked up a 19mm (3/4") can on aliexpress and ran a 3/4" hose from can to intake and 3/4" from can to a 3/4" to 5/8" reducer and 5/8" hose from reducer to PCV (about 6" 5/8" hose)OK, here's a new question, I measured the OD of the existing hoses and they were 5/8" so I assumed the ID was 3/8" and that's what I bought. I noticed in the pictures above that you used 5/8" ID hose. Any real advantage to a larger hose here? Theoretically you would get more air flow, but isn't the PCV a sometimes open thing anyhow?