02-07 Subaru WRX 2.0 04-14 Subaru WRX Sti 2.5 Easy to install and setup, the Subaru Dual Port features sequential ports for quiet operation on mild boost and full performance at full boost. SUPPLIED WITH: Blanking Plug, Yellow Spring rated -22 to -20 InHg (installed), Replacement Oil Breather Hose and Fittings, and a Gasket. Subaru Dual Port can only be run in either Dual Port or Plumb back configurations due to design of the factory return hose. This product does not have a CARB EO #; it is not legal for sale or use in CA on pollution controlled motor vehicles. This is intended as a "Race Only" product to be used solely for competition. It's use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization; any other use including recreational off-road use, may be a violation of local, state and federal laws. It is the buyer's responsibility to verify legal use of this product for the intended application and use. All Turbosmart BOVs are made out of tough and durable billet aluminium and offer a host of features designed to give them superior flow and performance.