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Package Contains: One Exhaust manifold, One Up Pipe with gaskets and bolts Outlet Size: 2.25" Primary Tube Size: 1.75" Head Flange Thickness: 7/16" Outlet Flange Thickness: 3/8" This bolts up to the cars existing exhaust. It can be used with performance parts as well. Manifold is made of 2 pieces and has a slip joint in the center. Dyno gains of 15 HP and 20 Torque FITS: Subaru Impreza WRX Turbo Years: 2002-2016 Subaru Impreza WRX STI Turbo Years: 2002-2016 Subaru Legacy GT Turbo Years: 2005-2009 Subaru Forester XT Turbo Years: 2004-2013 Subaru Outback XT Turbo Years: 2005-2009