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Disco96 there is a built in baffle on each valve cover internally. Yeah Toran I was tired of always finding Bosch D2/P38's with clogged OEM baffles, or engines seeping from every single place. I looked into doing just a standard type FV237 type PCV for the Bosch setup, but after I researched it I found a solution that worked in the proper direction and which was 100% bolt on and it replaced the brittle OEM baffle and OEM nipple at the intake with 1 part. I've installed a lot and I made it a Sticky in the D2 section. Lots of people have installed the FV308 style PCV and it works perfectly.
It should work out the same way with the GEMS setup. Only difference is it's mounted in between the breather lines vs directly on the intake. Flow and function will be the same so win win!
So with a stem on the top and bottom of the separator (from LR) the bottom stem sits on the baffle and with the added length has the top disk flush with top of tube and top stem going into hose a wee-bit
It's just a thin metal plate inside of the valve cover. Image is from Juke179r's thread, but you can clearly see the internal baffle plates. The port on the valve cover which sticks up then holds the plastic baffle.