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Cosworth High Flow Air Intake System ( Part Number:COS1 20019421)

Cosworth High Flow Air Intake System - Subaru WRX/STi 2002-2007

MODEL # COS1 20019421
Manufacturer Part # 20019421


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Cosworth's High Flow Intake Systems feature increased surface area of the element, large smooth radius bent aluminum inlet tubes for superior air flow management coupled with a high flow air filter for maximum air flow and performance.

Each kit includes an integrated heat shield designed to isolate the air intake from engine heat - delivering cold air into the engine for superior power conversion. The filter element is large, conical in shape and engineered to dramatically reduce intake restriction resulting in additional power and torque.
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Brand: Cosworth
Carb Exempt: [

Carb Restricted Shipping

If an Item is CARB exempt it means that it has undergone an engineering evaluation by CARB (California Air Recourses Board) and is shown to not increase vehicle emissions. If an item is CARB Exempt it will have an EO (Executive Order) number associated with it. Even if an item has an EO number it is not guaranteed to be CARB exempt for your vehicle. It is important to confirm that your Year Make and Model fall under the CARB EO number associated with the part. That can be confirmed either by checking the CARB website or the manufacturers website.
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Filter Color: Blue
Filter Element Type: Dry
Filter Material: Synthetic
Filter Reusable: No
Includes Airbox: Yes
Piping Color: Polished
Piping Material: Aluminum
Tuning Required: No

Mfgr. Warranty: 1 Year Limited 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.


This product has no user uploaded media. You can upload your photo or video of your install by posting a review. Reviews:

  • Q: Shipping weight and dimensions  Marat 1 month ago


    Hello sir/madam, Can you please advise the shipping weight and dimensions? Regards, Marat.

    • A: For shipping quotes give us a call at 801-748-4910 or chat with us!

      Devan M. 11 days ago
  • Q: 05 Sti with turboxs Fmic fittment  jonathangallo274825 3 years ago


    Will this intake fit with the turboxs Fmic on an 05 Sti?

    • A: We do not have a confirmation on fitment with the TurboXS kit.

      Nick S. 3 years ago
  • Q: Intake size  xeno_impreza 5 years ago


    Is this an upsized diamater intake? Does it join directly to the turbo inlet?

    • A: This joins directly to the turbo inlet, this is not an increased maf tube size.

      Nick S. 5 years ago
  • Q: Compatibilty  jonsVTECpower45016 5 years ago


    Will this CAI work with my Agency Power 3 hard pipe inlet?

    • A: This is a direct factory replacement unit. So if your inlet works with stock airbox then it will work with this intake.

      Kirill C. 5 years ago
  • Q: Compatibility  jindajiver 5 years ago


    Will this work with the AVO Silicone turbo inlet? Thanks.

    • A: Hello, unfortunately this intake will not work with the AVO inlet. The AVO inlet has the post MAF hose built in,and this intake requires the removal of the post MAF hose. Thanks.

      Rick C. 5 years ago