AEM Cold Air Intake | 2018 Subaru WRX STI 2.5L (21-836WR)

AEM Induction Systems


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AEM 21-836WR Cold Air Intake for 2018 Subaru WRX STI 2.5L

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.


  • Increased horsepower
  • Tuned and dyno-tested to improve acceleration and engine sound
  • Low restriction aluminum tubing
  • Easy to install using commonly available tools
  • Air filter lasts up to 100,000 miles before cleaning is required (depending on driving conditions)
  • Washable and reusable oil-free filter media
  • AEM Lifetime Limited Warranty


  • Estimated Horsepower Gain 22.1 HP @ 6217 RPM
  • Replacement Filter 21-2157DK
  • Air Filter Color Red
  • Air Filter Material Non-woven Synthetic
  • Air Filter Outlet Shape Round
  • Clamps Included 3
  • Clamp Material Stainless Steel
  • Clamp Style Worm Gear
  • Couplers Included 1
  • Product Style AEM Cold Air Intake System
  • Intake Pipe Color / Finish Wrinkle Red
  • Intake Pipe Material Aluminum
  • Street Legal In All US States No
  • TUV Approved (Europe) No
  • Weight 10 lb (4.5 kg)
  • Product Box Height 12.25 in (311 mm)
  • Product Box Length 20.25 in (514 mm)
  • Product Box Width 12.25 in (311 mm)
  • California Restricted Not legal for sale or use in California
  • Mounting Hardware Included Yes
  • Warranty Limited Lifetime


  • 2018 Subaru WRX STI 2.5L

What's In The Box?

  • Cold Air Intake Kit with Hardware


  • Manufacturer Standard Warranty


Customer Reviews

Based on 1 review
Great great sounds

This really does wake your car up with sounds and response I have had this about a year and I’d never get rid of this cold intake look perfect and sounds beautiful the little things do add up