SKU: 41804268990

AEM 2018 Subaru WRX STI 2.5L H4 F/I Cold Air Intake System - Wrinkle Red

Sale price$157.50 Regular price$175.00
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  • CAN

Ships within 48 hours · Estimated delivery Jul 17 - Jul 22

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Description

AEM 2018 Subaru WRX STI 2.5L H4 F/I Cold Air Intake System - Wrinkle RedThe AEM 21 836WR 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 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

The AEM 21-836WR 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 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 tapered 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 21-836WR vehicle applications to determine the legal status for each vehicle.

Technical Drawing
Installation Instructions
Installation Instructions

This Part Fits:

Year Make Model Submodel
2018 Subaru WRX STI Base
2018 Subaru WRX STI Limited
2018 Subaru WRX STI Type RA
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 41804268990

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4.3 ★★★★★
Based on 9 reviews
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Product Reviews
T
Verified Purchase
Thomas M. Cook
Carnegie, US
★★★★★ 5
As described, great quality
Perfect fit and function for 2018 Subaru Outback
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 15, 2026
M
Verified Purchase
Michael Mueller
Bozeman, US
★★★★★ 4
Good product
This is a long life filter without having to oil and wash like a lifetime k&n.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 18, 2025
C
Verified Purchase
Create58
New York, US
★★★★★ 5
Fits great
Excellent value for the money and fits great. Does exactly what you need it to.
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Reviewed in the United States on February 17, 2026
C
Verified Purchase
Carlos J. Caballero
Carnegie, US
★★★★★ 5
buen articulo funciona perfecto.
buen articulo funciona perfecto.
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Reviewed in the United States on May 14, 2026
M
Verified Purchase
Mr Frosty
Whiting, US
★★★★★ 5
Good fit, good value
Style: CF12436 Classic, Style: CF12436 Classic
Purchased this filter for my 2023 Outback. First off changing the cabin filter on this model Subaru is amazingly easy and can be done with no tools and no more then 5 minutes. Pictures posted show packaging, the paper "Blue" filter side, the "Black" charcoal side and the foam outer edge. The filter is well made and is very sturdy as the outer shell is plastic vs. other paper filters that are more flexible. Holding the filter in your hand and giving it a slite shake you can hear the activated charcoal within it. After installing the filter I had a few trips in the car, did I notice any difference in the air quality coming into the cabin....... no. But does this mean its not working? also no. What I can say is the filter fit snug and left no gaps, and with the plastic surroundings and foam in sure the filter will not be letting anything get by as it passes through the system. All and all this filter is well made and sturdy, and seems to be a good value with other paper only filters being about the same price.
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Reviewed in the United States on May 4, 2026

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