We got the opportunity to test the new Agency Power Cold Air Intake and Blow Off Valve on the 2008 Subaru STI.  The intake has already been tested on the new 2008 WRX, with power results show great gains.  The STI features a stronger engine and platform so we wanted to see what the results would yield.  This STI was completely unmodified.  The Blow Off Valve was set to vent 100% atmosphere.  The cold air intake was installed after the baseline dyno test was done showing 242HP and 257ft/lbs of torque to the wheels.  The after result showed a peak horsepower gain of close to 40whp at 5300rpm and a gain of 22whp at 6500rpm.  The torque peak was the same at stock, however after 4500rpm the torque stayed consistantly at an increase of around 20ft/lbs.

This intake is available as a short ram or cold air intake and includes a high flow K&N cone air filter, matching wrinkle red intake tube, AP silicone coupler, and aluminum heat shield.  You can purchase this intake and other parts from our dealers viewed here.