Made in USA
Cold Air Induction System
InfoVehicle Info Needed
AEM INDUCTIONPART NUMBER: 598-21-732C

Cold Air Induction System

$41999
ShippingShips on Nov 02, 2026
Lowest PriceLowest Price Guarantee

Subaru CAIS
    Cold Air Induction System
  • For Subaru WRX 2.0L H4
  • Gunmetal Gray
  • + 25 HP Increase

Emissions Note:

This part is legal for sale and use on Emissions Controlled Vehicles, in all 50 states, when used in accordance with the manufacturer's application guide because it has a California Air Resources Board (CARB) Executive Order (EO) #D-670-26

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

The Best Air Induction System On The Market!

AEM has pioneered the Cold Air Induction System (CAIS) for sport compacts. Their induction systems create more power than any other system. They relocate the filter outside of the engine compartment for a cooler intake charge. Every AEM air induction system is individually tuned in length and diameter, and features the highest standards of construction - AEM even guarantee's them for the life of your vehicle. Every AEM system is either C.A.R.B. exempt or pending C.A.R.B. exemption.

CAIS Key Features:

  • Outperform every comparable intake system on the market.
  • Utilizes a complete hardware kit with soft mounts for a guaranteed perfect fit.
  • Available powdercoated in Blue, Red, Silver and a unique maintenance-free Polished finish.
  • One-piece, four-layer, cotton-gauze AEM air filter eases installation and features an exclusive air horn design that improves performance.
  • Comprehensive installation instructions, AEM decals and license plate frame included.

Note: Short Ram Induction Systems Key Features are the same as the CAIS except it does not relocate filter outside of vehicle.

Part TypeAir Intake Kit
Product LineAEM Air Induction Systems for Subaru
BrandAEM INDUCTION
Package Height14.6
Package Width14.9
Package Length22.1
Weight12.36 PG
Part CategoryPerformance Parts
Estimated Horsepower Gain25 HP @ 4200 RPM
Estimated Horse Power Gain25 HP @ 4200 RPM
Filter ColorRed
Intake Pipe MaterialAluminum
Carb Eo NumberD-670-26
Clamp ColorNatural
Couplers IncludedNone
Coupler ColorNot Applicable
Intake Pipe Color / FinishGunmetal Gray
Mounting Hardware IncludedYes
Filter MaterialNon-woven Synthetic
Replacement Filter21-2027DK
Clamp StyleRegular
Oil IncludedNo
Air Filter Outlet ShapeRound
Clamp MaterialStainless Steel
Clamps Included1
Part FitmentDirect Fit
Horse Power Increase25 HP
WashableYes
Vendor Part Number21-732C
Package Qty1
Package TypeEA

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Some parts are not legal for use in California or other states with similar laws / regulations
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