AEM 2015+ Subaru WRX STi 2.5L H4 - Cold Air Intake System - Wrinkle Black

Brand: AEM

Product Code: 21-735WB

Availability:In stock

  • Increased horsepower
  • Tuned and dyno-tested to improve acceleration and engine sound
  • Low restriction aluminum tubing
  • 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


The AEM 21-735WB fits some Subaru Impreza WRX STi, Subaru WRX, and Subaru WRX STI models.

AEM Cold Air Intake Systems are designed to produce horsepower and torque gains. They replace the restrictive factory airbox and air filter to give you better performance and better engine sound. AEM cold air intakes relocate the air filter outside the engine compartment so cooler air can be fed into your engine. Cooler air carries more oxygen, which translates into a more intense explosion in the combustion chamber for more horsepower and torque. AEM Cold Air Intakes include an oversized AEM Dryflow synthetic washable air filter for outstanding air flow, filtration, and performance while allowing easy oil-free cleaning. They include a mandrel-bent aluminum intake tube and high quality hardware designed to reduce restriction and reduce intake temperature. The design and components of each intake system vary so consult the installation instructions for more information on the contents of each part number. 


AEM 21-735WB Product Specifications
Estimated Horsepower Gain 32 HP @ 5400 RPM
Replacement Filter 21-2029D
Air Filter Color Red
Air Filter Material Non-woven Synthetic
Air Filter Outlet Shape Round
Clamps Included 3
Clamp Material Stainless Steel
Clamp Style Regular
Couplers Included None
Product Style AEM Cold Air Intake System
Air Filter Height 9 in (229 mm)
Intake Pipe Color / Finish Wrinkle Black
Intake Pipe Material Aluminum
CARB EO Number D-670-24
Street Legal In All US States See Application Link Above
TUV Approved (Europe) No
Weight 8.9 lb (4 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)
Mounting Hardware Included Yes