PCV is hooked up as normal, with a check valve of course, however i pulled the throttle body off the other day and i noticed oil in it from the pcv port in the throttle body, i may need some kind of filter there. Inside the breathers is the orginal foam that came with them, plus a piece of sponge, walmart $1. sponge is just regualar sponge you would use to clean a car. Then i placed a fine wire mesh over the sponge to keep it compressed. I have checked for oil in the inlet pipe and there is a very slight film there, but its not even enough to make a drop. ALso take into consideration i have raced this with the breathers on at 26 psi on the street it is 100% totally dry with low boost. The use of clear hoses was used to show if there was any oil coming out of the breathers. Home depot has everything almosr