the PCV on the back of the block is to remove pressure from the CRANKCASE.

the slash cuts in the exhaust create a VENTURI effect an actualy PULL blow by out of the Breather box. If you run it the way i did, it recirculates the blow by back to the motor up top in the engine bay.

either way, oil residue should never be under your car. Removing the PCV valve an running the breather tube to the PCV box really is not a good idea. the PCV valve is a CHECK valve that only opens under pressure. if you iliminate it, its always open under positive an negative pressure.