The Cobb SF intake system utilizes several unique features in an effort to maintain optimal flow for performance while minimizing turbulence that can cause engine management problems. The SF intake features a custom conical cloth air-filter element, and a CFD-designed velocity stack that leads to a unique air flow straightener grid. This straightener grid is specifically designed to smooth the incoming air flow as it passes the Mass Air Flow sensor for precise readings. This eliminates the "dead spots" experienced by other aftermarket intakes due to turbulence. In order to provide a system that looks as good on the outside as the technical advancements happening on the inside, Cobb uses a one piece design constructed from a high temperature plastic composite. Not only does this save weight compared to the previous metal design, the plastic composite material offers much better heat rejection properties that help keep intake air temperatures cooler. In contrast, intake systems constructed using metal castings or piping can actually retain underhood heat and in turn heat the incoming air. The Cobb filter can be cleaned and re-used again and again. In case you lose or damage yours, we do sell replacements below. Fits all 2005-09 Legacy and Outback turbo models. (Does not fit non-turbo models.)