2015 & 2016 Subaru WRX STi 2.5L Turbo with AEM Cold Air Intake Get Power Boost & Style Points

AEM cold air intake for the 2015 and 2016 Subaru WRX STi with an EJ257 engine
AEM cold air intake, number 21-735WB, for the 2015 and 2016 Subaru WRX STi with an EJ257 engine is powdercoated in a wrinkle-black finish for increased power without being flashy

Subaru has given its flagship model, the WRX STi, a near complete redesign for the 2015 and 2016 model year. The 2015 and 2016 Subaru WRX STi, can’t be called all new because one thing hasn’t changed, namely the EJ257 intercooled and turbocharged 2.5L H4 boxer engine. AEM has a solid reputation for making Subaru WRX intake systems as the AEM cold air intake for the previous generation Subaru WRX STi made impressive power gains.

2015 and 2016 Subaru WRX STi shown here in a special purple vinyl wrap attended the 2014 SEMA Show
The 2015 and 2016 Subaru WRX STi shown here in a special purple vinyl wrap attended the 2014 SEMA Show in Las Vegas, Nevada and is equipped with an AEM performance cold air intake

AEM intakes has once again stepped up to the plate with cold air intake (CAI) 21-735WB, and produced an amazing estimated 32 horsepower maximum increase at the wheels of an otherwise stock 2015 and 2016 Subaru WRX STi. Dyno testing on the 21-735WB cold air intake was performed to back our substantial claims of increased horsepower. AEM dyno tests prove that this CAI produced an estimated maximum gain of 32 horsepower @ 5400 RPM and an estimated increased in torque of 31 lb-ft @ 5400 RPM.

The AEM cold air intake design for the 2015 and 2016 Subaru WRX STi positions the AEM Dryflow Air Filter in a location near the front of the car to help pull fresh air from outside the engine compartment. Bringing in cooler outside air can result in more power. The AEM synthetic Dryflow air filter is designed for low restriction without compromising engine protection. The AEM 2015 and 2016 Subaru WRX STi cold air intake Dryflow filter is washable and reusable. An AEM dry filter uses a synthetic air filter media and does not require oil which allows for quick, easy cleaning. An application specific powdercoated aluminum heat shield is included in the AEM CAI for the 2015 and 2016 STi to help prevent engine heat from increasing the inlet air temperature. "Excellent air inlet temperature management ensures consistent and reliable power," says product engineer John Concialdi.

AEM CAI 21-735WB replaces the restrictive factory air filter box and places the AEM Dryflow Air Filter outside of the engine bay
AEM CAI 21-735WB replaces the restrictive factory air filter box and places the AEM Dryflow Air Filter outside of the engine bay to help bring cool, dense, air into the engine

A mandrel bent aluminum air intake tube is utilized to direct cool intake air smoothly from the AEM Dryflow filter and into the turbocharger. This aluminum intake tube is protected by a wrinkle-black powdercoat finish to ensure the AEM cold air intake will look just as good as it performs. The wrinkle-black powercoat finish is being offered as an alternative to the wrinke-red version, number 21-735WR, for 2015 and 2016 Subaru WRX STi models. The entire AEM cold air intake, as well as the AEM Dryflow air filter is backed by the AEM limited lifetime warranty.

The 21-735WB cold air intake system is a perfect upgrade for 2015 and 2016 Subaru WRX STi enthusiasts looking to boost power and improve performance without calling attention to their mods. To find all AEM products for your vehicle, use the AEM Product Search link on AEMintakes.com. AEM products are available for purchase online, or to find an AEM dealer use the Where to Buy link on AEMintakes.com.


Estimated Horsepower Gain for AEM 2015 and 2016 Subaru WRX STi 2.5L Turbo Air Intake System

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AEM cold air intake 21-735WB showed gains of an estimated 32 more horsepower @ 5,400 RPM
AEM cold air intake 21-735WB was shown to provide power gains across the RPM range with an estimated 32 more horsepower and an estimated 31 ft-lbs of torque @ 5,400 RPM
  • Estimated Gain - 32 Horsepower @ 5,400
  • Protects Your Engine
  • Reusable Dryflow Synthetic Air Filter
  • Excellent Air Filtration
  • Lifetime Limited Warranty