AEM 50-State Legal Performance Air Intake Upgrades for Subaru WRX STi Forester BRZ and More

The VA series 2015 Subaru WRX is the first WRX to move away from the EJ-series engine

The VA series 2015 Subaru WRX is the first WRX to move away from the EJ-series engine replacing it with a 2.0L FA20DIT direct injection boxer engine with a twin-scroll turbocharger

The 2015 Subaru WRX STi is powered by the EJ257 intercooled and turbocharged H4 boxer engine

The 2015 Subaru WRX STi is powered by the EJ257 intercooled and turbocharged H4 boxer engine

AEM engineers design our short ram and cold air intake systems as a fully integrated component of the vehicle. Significant testing is performed to assure proper airflow management with the goal of keeping inlet air temperature (IAT) at or near ambient air temperature. AEM intake designers seek to create air intake systems that produce the highest power gains in the RPM range that will most enhance the driving experience. AEM intakes take advantage of several tuning methods to create power gains that are repeatable, safe, and consistent.

AEM has a solid reputation within Subaru enthusiast communities for creating Subaru short ram and cold air intake systems which boost horsepower and torque for WRX, WRX STi, BRZ, Forester, Impreza RS, Legacy, and Outback models. Additionally, AEM has streamlined its internal processes to make obtaining an Exemption Order (EO) from the California Air Resource Board (CARB) efficient. Obtaining an EO from CARB makes our air intake systems available for sale and use in California as well as all other states with similar emissions standards. Southern California has one of the densest populations of Subaru fans, and these owners are able to boost performance of their WRX, WRX STi, BRZ, Forester, Impreza RS, Legacy, or Outback without worrying about being hassled at their car’s next smog check.

The third gen Subaru WRX STI hatchback was released in the United States in March 2008

The third gen Subaru WRX STI hatchback was released in the United States in March 2008

In 2010 for the 2011 model year, the third generation Subaru WRX STI became available as a four-door sedan

In 2010 for the 2011 model year, the third generation Subaru WRX STI became available as a four-door sedan

AEM air intake 41-1408DS was shown to make an estimated 10 additional 50-state street legal horsepower for the following Subaru BRZ models:

2014 SUBARU BRZ 2.0L H4
2013 SUBARU BRZ 2.0L H4

AEM air intake 21-742C was shown to make an impressive estimated 23 additional 50-state street legal horsepower for the following Subaru Forester models:

2014 SUBARU FORESTER 2.0L H4

AEM street legal air intake, number 41-1408DS, for the 2013 and 2014 Subaru BRZ 2.0L H4

AEM street legal air intake, number 41-1408DS, for the 2013 and 2014 Subaru BRZ 2.0L

AEM street legal cold air intake, number 21-735WR, for 2015 Subaru WRX STi 2.5L models

AEM street legal cold air intake, number 21-735WR, for 2015 Subaru WRX STi 2.5L models

AEM cold air intakes, number 21-735WR and 21-735WB were shown to make an incredible estimated 32 additional 50-state street legal horsepower for the following Subaru WRX STi models:

2015 SUBARU WRX STI 2.5L H4

AEM air intake 21-732C was shown to make an impressive estimated 25 additional 50-state street legal horsepower for the following Subaru WRX models:

2015 SUBARU WRX 2.0L H4

AEM cold air intake 21-478WR was shown to make an unbelievable estimated 36 additional 50-state street legal horsepower for the following Subaru WRX and WRX STi models:

2014 SUBARU WRX STI 2.5L H4
2014 SUBARU WRX 2.5L H4
2014 SUBARU IMPREZA WRX STI 2.5L H4
2014 SUBARU IMPREZA WRX 2.5L H4
2013 SUBARU WRX STI 2.5L H4
2013 SUBARU WRX 2.5L H4
2013 SUBARU IMPREZA WRX STI 2.5L H4
2013 SUBARU IMPREZA WRX 2.5L H4
2012 SUBARU WRX STI 2.5L H4
2012 SUBARU WRX 2.5L H4
2012 SUBARU IMPREZA WRX STI 2.5L H4
2012 SUBARU IMPREZA WRX 2.5L H4
2011 SUBARU IMPREZA WRX STI 2.5L H4
2011 SUBARU IMPREZA WRX 2.5L H4
2010 SUBARU IMPREZA WRX STI 2.5L H4
2010 SUBARU IMPREZA WRX 2.5L H4
2009 SUBARU IMPREZA WRX STI 2.5L H4
2009 SUBARU IMPREZA WRX 2.5L H4
2008 SUBARU IMPREZA WRX STI 2.5L H4
2008 SUBARU IMPREZA WRX 2.5L H4

AEM cold air intakes, numbers 21-477C and 21-477P, are street legal in all 50 states and designed to boost horsepower and torque for the following Subaru models:

AEM street legal air intake, number 21-732C, for the 2015 Subaru WRX 2.0

AEM street legal air intake, number 21-732C, for the 2015 Subaru WRX 2.0L

AEM street legal cold air intake for 2008-2014 Subaru WRX and WRX STi 2.5L models

AEM street legal cold air intake, number 21-478WR, for 2008-2014 Subaru WRX and WRX STi 2.5L models

AEM street legal cold air intake, number 21-477P, for 2004-2007 Subaru WRX STi 2.5L models

AEM street legal cold air intake, number 21-477P, for 2004-2007 Subaru WRX STi 2.5L

2007 SUBARU IMPREZA WRX STI 2.5L H4
2007 SUBARU IMPREZA WRX 2.5L H4
2006 SUBARU IMPREZA WRX STI 2.5L H4
2006 SUBARU IMPREZA WRX 2.5L H4
2005 SUBARU IMPREZA WRX STI 2.5L H4
2005 SUBARU FORESTER TURBO 2.5L H4
2004 SUBARU IMPREZA WRX STI 2.5L H4
2004 SUBARU FORESTER TURBO 2.5L H4

AEM cold air intakes, numbers 21-475B, 21-475C, and 21-475P are street legal in all 50 states and designed to boost horsepower and torque for the following Subaru models:

2006 SUBARU OUTBACK XT 2.5L H4
2006 SUBARU LEGACY GT 2.5L H4
2005 SUBARU OUTBACK XT 2.5L H4
2005 SUBARU LEGACY GT 2.5L H4

AEM short ram air intakes, numbers 22-474B, 22-474P, and 22-474R, are street legal in all 50 states and designed to boost horsepower and torque for the following Subaru models:

2007 SUBARU IMPREZA WRX STI 2.5L H4
2007 SUBARU IMPREZA WRX 2.5L H4
2006 SUBARU IMPREZA WRX STI 2.5L H4
2006 SUBARU IMPREZA WRX 2.5L H4
2005 SUBARU IMPREZA WRX STI 2.5L H4
2005 SUBARU IMPREZA WRX 2.0L H4
2005 SUBARU FORESTER TURBO 2.5L H4
2004 SUBARU IMPREZA WRX STI 2.5L H4
2004 SUBARU IMPREZA WRX 2.0L H4
2004 SUBARU FORESTER TURBO 2.5L H4
2003 SUBARU IMPREZA WRX 2.0L H4
2002 SUBARU IMPREZA WRX 2.0L H4

AEM cold air intakes, numbers 21-474B, 21-474C, 21-474P, and 21-474R, are street legal in all 50 states and designed to boost horsepower and torque for the following Subaru Impreza WRX models:

2005 SUBARU IMPREZA WRX 2.0L H4
2004 SUBARU IMPREZA WRX 2.0L H4
2003 SUBARU IMPREZA WRX 2.0L H4
2002 SUBARU IMPREZA WRX 2.0L H4

AEM cold air intake, number 21-472P is street legal in all 50 states and designed to boost horsepower and torque for the following Subaru Impreza RS models:

2004 SUBARU IMPREZA 2.5L H4
2003 SUBARU IMPREZA 2.5L H4
2002 SUBARU IMPREZA RS 2.5L H4

To find an AEM performance upgrade for your Subaru and determine if it’s legal in all 50 states, use the AEM Product Search 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.