Don't cut out the stock Mass Air Flow (MAF) plug to convert to Speed Density (SD) in your Subaru. Use iWire's plug and play Speed Density harness that converts the stock connector to the new Intake Air Temperature Sensor connector. 
 
Our standard adapter length is 36 inches which works with most common applications. We can also do a 48 inch version which works for applications with a Front Mount Intercooler or any setup that the IAT sensor is not on or near the manifold and/or throttle body.
 
Our harness is built to last with Mil-spec grade materials like flame retardant, corrosion, and abrasion resistant Tefzel wire. We've also wrapped it in Raychem DR-25 heat shrink tube that can withstand the harsh environment of the engine bay. 
 
Select "Standard Connector" for most IAT sensors including standard GM, IAG IAT sensor as well as AEM part number 30-2010.
 
Select "Alternate Deutsch Connector" for the 1/8" NPT Thread Air Temperature Sensor found on AEM part number 30-2014.
 
Looking for a Hybrid MAF Adapter for your Subaru?
 
Note: Sensors not included but can be purchased
 
Compatible Cars:
2002+ STi
2002-2014 WRX
2004-2014 Forester XT
2005 - 2012 Legacy GT
2005- 2012 Outback XT