aFe TA-4301P Takeda Cold Air Intake System for Subaru WRX STI 2008-2011 H4-2.5L Produces 34 horsepower and 31 pounds by feet torque Constructed out of lightweight clear-coat anodized tubing for maximum air flow Includes a 360 degree Pro Dry S air filter The PRO Dry S air filter requires no oils and cleans with simple soap and water Comes with tubing, filters, couplers and hardware