The 2013 Ford Focus ST has a lot going for it. This 2.0L front-wheel drive, turbocharged, four- cylinder engine pumps out around 250 hp in its stock form, which is impressive for a two-year-old car you can find for under $20,000. Ford now has two weapons in its modern sport-hatch arsenal, and the company is staying competitive. Most car enthusiasts elect to remove the stock intake system first so they can free up some contained power potential. The story here is no different with our development of an upgraded Ford Focus ST intake.
The Stock System
Our garage was graced with the presence of a nice 2013 Performance Blue Focus ST. Per the usual routine, we began taking apart the stock intake system to familiarize ourselves with and understand Ford's design. One unique element of this Focus ST intake is how air is drawn into the box. As you can see below, the air duct is split into two and the airflow gets routed to both the top and bottom of the system.