*????????AEM 21-478WR RED Cold Air Intake System Subaru Impreza WRX (2008, 2009, 2010, 2011, 2012, 2013, 2014) Subaru Impreza WRX STI (2008, 2009, 2010, 2011, 2012, 2013, 2014) The AEM 21-478WR is a performance cold air intake system specifically designed for 2008–2014 Subaru WRX and WRX STI models Estimated Gains: Dyno-tested by the manufacturer showing an estimated maximum horsepower gain of up to 36 HP at 5,300 RPM
