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AEM Cold Air Intake Gunmetal Grey ( Part Number:AEM 21-477C)

AEM Cold Air Intake Gunmetal Grey - Subaru WRX/STi 2004-2007

MODEL # AEM 21-477C
Manufacturer Part # 21-477C


MSRP: $443.99

Only 3 left!
Qualifies for free shipping!


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 gunmetal color
  • Air filter can last up to 100,000 miles before cleaning is required
  • Air filter is washable and reusable
  • Comes with the DryFlow filter option
  • 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
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Brand: AEM
Carb Exempt: Yes
Carb E.O. Number: D-670-6
Filter Color: Grey
Filter Element Type: Dry
Filter Material: Cotton
Filter Reusable: Yes
Includes Airbox: No
Piping Color: Grey
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.




Another quality product from AEM
BananaSammiches 10 months ago
I decided to pick up this intake for 2006 WRX, as I previously had the Perrin short-ram and intake temps were just too high for my liking, and it would very quickly become heatsoaked when not moving. What a huge difference. After letting it idle in my driveway for almost 20 minutes, my intake temps never got above 4 or 5 degrees above ambient. Install was pretty straightforward. I decided to remove my fender to make everything easier to access. A little tedious, but overall, very simple. Now, even though the description states a tune is not required, you definitely need to tune for any aftermarket intake for MAF scaling and A/F ratio purposes. I know a lot of people out there say that a CAI doesn't matter because the air is heated up due to the compression that takes place in the turbo, and is then cooled through an intercooler. While this is true, your IAT (intake air temperature) sensor is located within the MAF sensor, so, if your IATs are very high, it won't matter how efficient your intercooler is, your ECU will still pull timing when the temperature reaches 125+ degrees. So, for the purposes of ECU calibration, yes, a CAI intake definitely makes a huge difference. You won't ever pull timing with this thing. Do yourself a favor and learn from my mistakes, don't buy a short-ram intake, and pick up one of these. You'll be glad you did. I also purchased the AEM DryFlow filter cover to protect against dirt and water. So, if you're concerned about the location of the filter making it vulnerable to dirt and moisture, buy one of those covers and you'll have nothing to worry about.


so far so good
spiffy 4 years ago
good looking pipe with a gigantic filter attached to it. Does not fit with AVO's extended one piece silicone inlet. I had to modify the pipe by removing five inches of pipe post MAF location. Worked out nicely in the end. Still in break-in tune mode., however the MAF has been scaled in nicely and there appears not to be any abnormal turbulence created by the pipe modification.
Verified Purchase

Also fits 2006-2008 Forester XT
lemming 5 years ago
I was looking for another intake that would fit my '06 FXT Limited because the Cobb SF is a bit too noisy for my tastes. This one fit just fine without any modifications or tweaks.

  • Q: Compatible with FMIC  atriplis99773 3 years ago


    Do you guys happen to know if this will fit with the Perrin FMIC? Curious if the pipes will hit on an 06 Sti. Thanks

    • A: As of right now we have not tested the products together to determine compatibility. We will not be able to guarantee fitment.

      Trevor C. 3 years ago
  • Q: aem cai  O6hawkeye 3 years ago


    Will this aem cai fit a perrin turbo inlet

    • A: This intake will work with a perrin turbo inlet. Sometimes a coupler is needed for perfect fitment.

      Trevor C. 3 years ago