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AEM Cold Air Intake (Part Number: )
AEM Cold Air Intake (Part Number: )
AEM Cold Air Intake (Part Number: )
AEM Cold Air Intake (Part Number: )
AEM Cold Air Intake (Part Number: )
Community Media
AEM Cold Air Intake (Part Number: )
AEM Cold Air Intake (Part Number: )
AEM Cold Air Intake (Part Number: )
AEM Cold Air Intake (Part Number: )
AEM Cold Air Intake
Subaru WRX/STI 2008-2014
Read 6 Reviews | 9 Q&As
Part # 21-478WR
$283.99
msrp: $417.79

In stock! Ships same day

Features & Product Details

RallySport Direct is proud to provide you with another quality performance intake system brought to you by AEM.

On this page, you are looking at the AEM Cold Air Intake System designed specifically for your application to replace the factory restrictive intake system to increase both power and performance. This is a complete kit that replaces your factory air filter and air intake housing and has been dyno-proven to produce more power and torque.

Here are the details:

  • Tuned and dyno-tested to improve acceleration and engine sound
  • Low restriction aluminum intake pipe
  • Intake pipe will come powder-coated a wrinkle-red finish
  • Black powder-coated intake heat shield included
  • Includes DryFlow filter option
  • Air filter can last up to 100,000 miles before cleaning is required
  • Air filter is washable and reusable
  • Increased horsepower
  • Improved throttle response
  • Improved torque
  • Reduced turbo lag
  • Increased intake sound
  • Includes new clamps
  • Note that a tune is required to utilize the maximum performance from this intake
  • Specifications

    Brand: AEM
    Carb Exempt: Yes
    Carb E.O. Number: D-670-21
    Filter Color: Grey
    Filter Element Type: Dry
    Filter Material: Cotton
    Filter Reusable: Yes
    Includes Airbox: Yes
    Piping Color: Red
    Piping Material: Aluminum
    Tuning Required: No
    Mfgr. Warranty: Limited Lifetime Warranty
    Condition: New Product
    Return Policy:

    RallySport Guarantee - 30 Days


    Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

    RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

    The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
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    PEOPLE WHO VIEWED THIS ITEM ALSO VIEWED

    REVIEWS & CUSTOMER MEDIA

    6 Reviews
    4.2 out of 5 Stars
    5 Stars
    (2)
    4 Stars
    (3)
    3 Stars
    (1)
    2 Stars
    (0)
    1 Stars
    (0)
    Customer Photos and Videos
    AEM Cold Air Intake ( Part Number: 21-478WR)
    AEM Cold Air Intake ( Part Number: 21-478WR)
    AEM Cold Air Intake ( Part Number: 21-478WR)
    AEM Cold Air Intake ( Part Number: 21-478WR)
    Hotter than stock 8 months ago
    teppey
    I live in a tropical climate with ambient temperature range between 75℉ to 95℉. My car is 2011 Subaru WRX STi and my previous build used this intake along with the stock turbo. I kept my fog lamp and it most likely hinder fresh air to the intake. My IAT was around 130℉ - 180℉. I recently upgraded the turbo to BPT 1.5XT-R and revert back the intake to stock intake and my IAT improved to 110℉-160℉ and saw noticable gain in the low RPMs. AFAIK the stock intake is sufficient up until 400hp and would not recommend this product unless you upgrade your turbo bigger than TD06-20G
      
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    Awesome Intake, PITA Install 2 years ago
    rulejunior
    I ordered this to go along with the archived stage 1 maps for my 2010 WRX Sedan to help deal with the summer heat and to give me a little extra kick in the pants off the line, plus who doesn't love a little extra turbo noise under the hood? Assembly was relatively easy, as the intake was simple to put together and removing the stock intake was trivial. However, the engine bay was tight and getting this to fit in was an undertaking that took a couple shots. Once in, hooking it up went smooth, One tip was to fit the silicone coupler on the turbo intake tube before sliding it on the CAI pipe, which is what I did and made it a little easier to install. All in all, I give it 4 stars. That final install was just a killer for me
      
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    You need this. Trust me. 2 years ago
    DROOTx26
    This product definitely opens up what was hiding in your engine all along. If you go from stock to this, plus a Cobb Accessport (AEM archived map available only up to Stage 2) you'll definitely feel your power gains. The sounds are amazing as well. Easy straight-forward install. AEM is top quality all around. Highly recommend.
      
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    1 of 1 people found the following review helpful
    Solid CAI for 2013 Subaru WRX 2 years ago
    Jesse
    I have the COBB access port and have been monitoring my inlet temperatures for a while now. I also used to own the COBB "cold air" intake as well. This intake has a much better design than the COBB intake in that it routes the filter into the wheel well and does a pretty decent job of sealing away from the engine. At cruising speeds the temps tend to say around 10° - 12° above ambient and then at stop and go traffic will jump up a bit to 15° to 20 ° above ambient. In comparison to the COBB intake, the temps would stay 2° to 3° cooler at cruising but jump up 40° to 50° above ambient in stop and go traffic. In summary, I believe that this intake keeps the temperature pretty consistent with ambient but due to the lack of airflow in the wheel well the temps tend to be slightly higher at cruising than the stock intake and the COBB intake due to their use of the factory snorkel. I might try drilling out the holes in the grill piece of the front bumper to let more air into the wheel well - will update if i do.
      
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    1 of 1 people found the following review helpful
    Great Intake, Great Sounds , Improved top end. 2 years ago
    Stephen G
    I originally bought this to help with the summer heat and it definitely did. The car doesn't feel as sluggish during the hot weather so I gave it a 5 in Performance. I gave it a 4 on ease of install because its pretty straight forward but some of the parts are a pain in the ass to align up and move around. Good on price compared to others. And the quality of everything was excellent. I gave it a 4 overall because while your installing it into the fender area if you move it too much the metal on the car will cut up the filter so make sure you get the filter cover which I couldn't wait to get and will probably have to replace the filter early.
      
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    QUESTIONS & ANSWERS

    • Q: How much does this weigh?  dkbxr22 days ago

      Hi there, Currently living over seas. Would like to know the weigh as a friend might be traveling to the US to bring it back for me!
    • Q: Tune  Keaton4 months ago

      I’ve read a lot of mixed reviews, does this require a tune after install
    • Q: Bypass Valve  itsjeffree6 months ago

      Anybody install this with a bypass valve?
    • Q: CARB Sticker  Brandon12 months ago

      Does this come with the CARB exempt sticker?
    • Q: Upgraded turbo inlet?  Wolfhead 1 year ago

      Will this fit on a 3" perrin inlet?
      • 1 of 1 people found the following answer helpful

        A:  Yes this can fit with the Perrin 3" inlet.

        Tyler G.
          
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