 Today's Cobb highlight will convince you to separate your money from your wallet, because after watching this, you will definitely want to buy the Cobb tuning air oil separator for the Ford Focus ST, Focus RS and EcoBoost Mustang. Every direct injected turbo engine needs an air oil separator, but they're not all created equal, so here's a breakdown of what makes the Cobb tuning version special. Oil vapor from the PCV system will gradually build up carbon deposits on the engine's intake valves and within the combustion chamber. That causes inefficiency in airflow as well as the combustion process that robs power and increases the likelihood of detonation which can severely damage the engine. The Cobb kit resolves that problem with a two part design, a baffled swirl pot style air oil separator and a baffled breather plate directly on the block. The Cobb breather plate is a custom design that sandwiches between the factory plate and the crankcase and it's constructed of injection molded 33% glass filled nylon with stainless steel bolt hole reinforcement inserts and extended bolts. The plate is sealed to the block with the same OEM gasket type as the stock part, but adds an additional custom perforated baffle to instantly begin trapping oil vapor. Also, some year models of the Focus and Mustang have a specifically designed OEM plate with additional baffling, meaning that combined with the Cobb breather plate, you have two levels of oil vapor traps before the gases even reach the separator can. Speaking of which, the Cobb air oil separator can is a two piece unit machined from 6061 T6 aluminum and is anodized black. As mentioned before, the Cobb air oil separator makes use of a swirl pot design. As crankcase gases enter the fitting on the upper side of the can wall, they are forced to swirl around the inside. There's an additional cylinder mounted within the can that creates a gap between the outer wall and the center. The unwanted oil vapor collects on both surfaces as the gas continue to move around and downward. Once near the bottom of the can, the base of the internal cylinder has a perforated floor that allows the gases to move back upward in the middle while providing even more surface area to capture remaining oil vapor. The gases have to exit through the top of the can, but only when the intake side of the engine is under vacuum. So there is a fitting at the very top that connects to the intake manifold. Even just below that, a flip ball valve is used to stop air pressure from the manifold going backwards into the crankcase through the air oil separator when the car is making boost. The can is bolted in the engine bay with a custom black bracket and provided stainless steel hardware. Plus, because the can is a threaded two part design, it can be easily opened up during oil changes to inspect and clean out inside if necessary. An additional benefit of the Cobb design is that we include three five-eighths inch internal diameter hoses that are much longer and larger than the factory PCV hoses. That offers even more volume and surface area opportunity to further separate oil vapor as the gases move through them, which brings us to one more important point. All of the oil that collects in the breather plate or can drains back to the crankcase. Some people have concerns about that because they're familiar with using catch cans on these engines. With a catch can, any captured oil simply collects at the bottom of the can and stays there until manually dumped out. The issue that results is that often when people open their catch can, they see that the bottom is full of a milky light brown goo. That goo is a combination of oil, fuel, and water that is condensed inside the can over time. The fear is that with a drain back design of an air oil separator, that same goo must exist and is just draining back into your crankcase. Luckily, we considered that and did plenty of testing to ensure that it does not occur. In fact, with our system, the nasty goo typically won't even exist. We installed our air oil separator and a typical catch can on some test vehicles. And after several thousand miles, we sent oil samples to Blackstone Labs and discovered that not only do we not see any goo inside of our separator, the oil test from the car with our product came back with virtually the exact same results as a completely stock car, meaning there was no fuel or water dilution in the oil as a result of the air oil separator draining back. So if you have a focus or a must hang with an EcoBoost engine, an air oil separator is an absolute must own product. And we're confident that the CogTuning air oil separator is the best option on the market. They're available right now at CogTuning.com.