Air Intake Kit

Cold Air Induction System

Cold Air Induction System; Incl. Dryflow Air Filter/Alum. Tubing/Clamps; Estimated 36 HP Gain @ 5300 RPM; Wrinkle Red;

• Air Box Included: No
• Air Filter Element Washable: Yes
• Air Filter Height: 9.125 in. (232mm)
• Air Filter Large End Diameter: 6 in (152 mm)
• Air Filter Oulet Length: 2.75 in. (70 mm)
• Air Filter Oulet Width: 2.75 in. (70 mm)
• Air Filter Outlet Shape: Round
• Clamp Color: Natural
• Clamp Material: Steel
• Clamp Style: Regular
• Clamps Included: 3
• Coupler Color: Not Applicable
• Couplers Included: None
• Estimated Horse Power Gain: 36 HP @ 5300 RPM
• Filter Color: Red
• Filter Material: Non-woven Synthetic
• Horse Power Increase: 36 HP
• Intake Pipe Color / Finish: Wrinkle Red
• Intake Pipe Inlet Length: 19.00 in. (483 mm)
• Intake Pipe Inlet Shape: Round
• Intake Pipe Inlet Width: 2.75 in. (70 mm)
• Intake Pipe Material: Aluminum
• Intake Pipe Outlet Length: 19.00 in. (483 mm)
• Intake Pipe Outlet Shape: Round
• Intake Pipe Outlet Width: 2.75 in. (70 mm)
• Item Weight: 7.4000 lbs.
• Mass Air Flow Sensor Included: Mass Air Flow Sensor Adapter Included When Required
• Mounting Hardware Included: Yes
• Oil Included: No Filter Oil Required
• Package Material: Paperboard
• Package Type: Box
• Product Box Height: 12.25 in. (311mm)
• Product Box Length: 20.25 in. (514mm)
• Product Box Width: 12.25 in. (311mm)
• Replacement Filter: 21-2029DK
• RPM: 5300
• Street

• Increased Horsepower
• Tuned And DynoTested To Improve Acceleration And Engine Sound
• Low Restriction Aluminum Intake Tube
• Air Filter Lasts Up To 100 000 Miles BF Cleaning Is Required
• Washable And Reusable Oil Free Filter Media
• AEM Lifetime Limited Warranty

The AEM 21-478WR Performance Cold Air Intake System produces horsepower and torque gains by replacing your vehicle's restrictive factory air filter and air intake housing. This air intake system was designed, tuned and dyno-tested to fit specific Subaru WRX, WRX STI, Impreza WRX and Impreza WRX STI models. Air enters the system through an oversized AEM Dryflow synthetic washable air filter for outstanding air flow, filtration and performance. The air filter is located in the original air box space and is protected by a heat shield which is designed to reduce intake air temperature and increase horsepower. The intake tubing is constructed from mandrel-bent aluminum featuring a durable textured red powder coated finish. This air intake system was developed to accommodate the engine's factory emissions control devices including the mass air flow sensor. The cylinder shaped AEM Dryflow air filter is made from an oil-free, synthetic filter media that can be used for up to 100,000 miles before cleaning is needed (depending on driving conditions). The air intake system is easy to install with commonly available tools and it is backed by AEM's Lifetime Limited Warranty. Some AEM air intakes are not legal for sale or use in California and other states adopting California emission standards while others are 50 state legal. View the 21-478WR vehicle applications to determine the legal status for each vehicle.

Innovation has always been AEM's core competency. As J.C. would say "if you can't make something better, why make it all?" This "make it better" drive combined with our commitment to the sport compact market continues to distinguish AEM from the many company's offering "Me Too" copycat products. Our innovations are inspired by a passion for engineering excellence, being there and getting our hands dirty, the only way to really understand technology enough to make it better. The company continues to lead the way with innovative products that push the envelope of what is possible.