Subaru Impreza STI Hatchback Carbon Fiber Front Airdam 2008 2010 2006 2007 Subaru Impreza Base WRX Carbon Fiber Rear Diffuser by Seibon For Subaru Impreza WRX STi 2006 2007 Carbon Fiber Hood Bonnet Intake Welcome to Extreme Dimensions :: Inventory Item :: 2011 2014 Subaru. Underbody components such as front air dams, undertrays, and rear diffusers are essential for maximizing aerodynamic performance. The APR Performance Front Air Dam integrates with the factory front bumper to: Reduce lift. Increase front end stability. Improve high speed cornering grip This Front Air Dam also utilizes a built in aerodynamic splitter design that creates a high pressure region of air atop the protruding surface, further reducing lift and increasing net downforce.