Here's a brief article explaining the stock Mazdaspeed/Eco Boost PCV setup, it's limitations, and how PERM's Dual Port PCV Plate may be used to improve upon it. All cars generate pressure in their crankcase, it's the nature of the beast with piston engines, and the Mazdaspeeds are no different. A majority of this pressure results from combustion gasses pushing past the piston rings and entering the crankcase, hence the coined term "blow by". As the rings wear, and this seal degrades... the amount of blow by will increase. Blow by will also increase as the power output of motor increases... Increased power comes from increased cylinder pressure... which will naturally increase blow by. In stock form, there are two ports on the engine that are used to mitigate this issue: one on the valve cover, and one on the short block (just under the intake manifold). And, since the Mazdaspeed/Eco...
