2004 Subaru WRX Air Intakes

    • Mishimoto® - Silicone Induction Hose
      Subaru WRX 2004, Silicone Induction Hose by Mishimoto®. The silicone air intake hoses are made with a combination of high grade silicone and heat-resistant embedded fibers to prevent increased temperatures in the intake charge caused by excess...
      Our price: $194.67$194.67 20% OFF
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    • Mishimoto® - Silicone Airbox Hose
      Subaru WRX 2004, Silicone Airbox Hose by Mishimoto®. The silicone air intake hoses are made with a combination of high grade silicone and heat-resistant embedded fibers to prevent increased temperatures in the intake charge caused by excess...
      Our price: $64.89 - $67.98$64.89 20% OFF
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    • FRAM® - Tough Guard™ Panel Air Filter
      Subaru WRX 2.0L 2004, Tough Guard™ Panel Air Filter by FRAM®. This premium air filter is engineered to meet extreme driving conditions. It features a pre-oiled filter media for increased dirt holding capacity and a heavier filter screen to...
      Our price: $12.19$12.19 20% OFF
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    • FRAM® - Extra Guard™ Panel Air Filter
      Subaru WRX 2004, Extra Guard™ Panel Air Filter by FRAM®. Most dirt and dust enters the engine through the air filter and FRAM Extra Guard is engineered to provide twice the air filtration compared to an original filter. It also keeps the engine...
      Our price: $8.80 - $9.36$8.80 20% OFF
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    • Full® - Air Filter
      Subaru WRX 2004, Air Filter by Full®. If you have a dirty air filter, clogged PCV valve, or defective MAF sensor you may be tempted to just run down to the local auto parts chain store for a replacement, but before you waste your time and gas,...
      Our price: $10.38$10.38 20% OFF
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    • Hastings® - Air Filter
      Subaru WRX 2.5L 2004, Air Filter by Hastings®. Clean air is critical to the performance of your engine, so don’t trust just any filter. Hastings filters are tested according to SAE J726 test procedures, where they meet or exceed the exacting...
      Our price: $14.57$14.57 20% OFF
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    • Kinsen® - Air Filter
      Subaru WRX 2004, Air Filter by Kinsen®. If you have a dirty air filter, clogged PCV valve, or defective MAF sensor you may be tempted to just run down to the local auto parts chain store for a replacement, but before you waste your time and gas,...
      Our price: $11.74$11.74 20% OFF
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    • MANN-Filter® - Air Filter
      Subaru WRX 2004, Air Filter by MANN-Filter®. Get excellent engine protection and more economical operation just by replacing your air filter. This MANN air filter is specially designed for your vehicle to ensure a precise fit and proper...
      Our price: $7.56$7.56 20% OFF
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    • Motorcraft® - Air Filter
      Subaru WRX / WRX STI 2004, Air Filter by Motorcraft®. Type: 159. The air filter is a simple yet crucial part of your vehicle that keeps dust and road debris out of the engine. If the air filter is clogged up and starts to choke off the airflow to...
      Our price: $19.04$19.04 20% OFF
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    • NPN® - Air Filter
      Subaru WRX 2004, Air Filter by NPN®. If you have a dirty air filter, clogged PCV valve, or defective MAF sensor you may be tempted to just run down to the local auto parts chain store for a replacement, but before you waste your time and gas,...
      Our price: $6.80$6.80 20% OFF
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    • Purolator® - Air Filter
      Subaru WRX 2004, Air Filter by Purolator®. If you have a dirty air filter, clogged PCV valve, or defective MAF sensor you may be tempted to just run down to the local auto parts chain store for a replacement, but before you waste your time and...
      Our price: $12.08$12.08 20% OFF
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    • Denso® - Air Filter
      Subaru WRX 2004, Air Filter - Panel Type by Denso®, 1 Piece. The air filter is the last line of defense against the harmful airborne abrasives that have been proven to wear out engines before their time. With OE-quality engineering and materials,...
      Our price: $14.44$14.44 20% OFF
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    • K&N® - Round Tapered Air Filter
      Universal Round Tapered Air Filter by K&N®. Get better performance, superior engine protection and more economical operation with a K&N Air Filter. K&N Universal Air Filters are available for just about any application.
      Our price: $22.35 - $124.62$22.35 20% OFF
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    • K&N® - Round Straight Air Filter
      Universal Round Straight Air Filter by K&N®. Get better performance, superior engine protection and more economical operation with a K&N Air Filter. K&N Universal Air Filters are available for just about any application.
      Our price: $23.67 - $259.55$23.67 20% OFF
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    • K&N® - Oval Tapered Air Filter
      Universal Oval Tapered Air Filter by K&N®. Get better performance, superior engine protection and more economical operation with a K&N Air Filter. K&N Universal Air Filters are available for just about any application.
      Our price: $33.98 - $198.78$33.98 20% OFF
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    • Weapon-R® - Mass Air Flow Adapter
      Subaru 3.0L 1995-2004, Mass Air Flow Adapter by Weapon-R®, 3" Inlet. This universal adapter will let you attach that air cleaner of your choice to the inlet of your airflow sensor. Made from rugged plastic, it bolts to flat inlet of the sensor,...
      Our price: $13.00$13.00 20% OFF
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    • Spectre Performance® - AccuCharge Precision Air Filter Oiling System™
      Universal AccuCharge Precision Air Filter Oiling System™ by Spectre Performance®. Rooted in racing, Spectre Performance designs and builds every product with the same goal in mind - the best performance in the market proven on the racetrack!...
      Our price: $10.02$10.02 20% OFF
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    • Denso® - Mass Air Flow Sensor
      Subaru WRX / WRX STI 2004, Mass Air Flow Sensor by Denso®, 1 Piece. The air filter is the last line of defense against the harmful airborne abrasives that have been proven to wear out engines before their time. With OE-quality engineering and...
      Our price: $156.54$156.54 20% OFF
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    • Delphi® - Mass Air Flow Sensor
      Subaru WRX 2004, Mass Air Flow Sensor by Delphi®. Delphi MAF sensors provide the engine control module (ECM) with continuous information regarding how much — and how fast — air is entering the engine. This ensures optimal engine performance,...
      Our price: $135.89$135.89 20% OFF
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    • Genuine® - New Air Mass Meter
      Subaru WRX 2004, New Air Mass Meter by Genuine®. If you have a dirty air filter, clogged PCV valve, or defective MAF sensor you may be tempted to just run down to the local auto parts chain store for a replacement, but before you waste your time...
      Our price: $267.35$267.35 20% OFF
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    • JET® - Mass Air Flow Sensor
      Subaru WRX 2004, Mass Air Flow Sensor by JET®. Powr-Flo; Mass Air Sensor.
      Our price: $149.96$149.96 20% OFF
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    Customer Reviews
    4.5(4.5)
    2003 Subaru WRX
    Posted by

    "Intake adds noticeable power and sounds fantastic under medium to hard acceleration. Moderately difficult to install because of having to removing air resonator chamber inside the front bumper. Even after that, it's a tight squeeze getting the intake to fit. Great product though and is totally worth the installation time. Be sure to monitor your air to fuel ratio after installation, your engine might be getting too much air and run lean."

    5(5)
    2008 Subaru WRX
    Posted by

    "I bought the Injen SP Cold Air Intake for my 2012 WRX, and I love it. Before I bought it, my car was getting 24.9 mpg. Now after the intake is installed, I am getting between 30.3 and 33.1 mpg, depending on how hard I drive it. The power increase is noticeable right away, and the sound of the intake after 3k rpms is awesome. Only took 30 minutes to install myself."

    4(4)
    2008 Subaru WRX
    Posted by

    "Installation was a breeze, well documented instructions. Obviously a re-tune of the ECU is needed to see any real benefits."