For 05-10 Chevy Cobalt Non-Turbo DNA Motoring Stainless Steel Headers Exhaust Replace stock restrictive headers and increase horsepower and torque. Made of High Quality T304 Stainless Steel Material. TIG Welded CNC Machine Flange. Gaskets, bolts and nuts are included. Inlet: 1.63" X 0.88" (Oval). Outlet: 3.25" Professional Installation is Highly Recommended (No Instruction is Included) Vehicle Application: 2005 2006 2007 2008 2009 2010 Chevy Cobalt Non-Turbo / Non-Supercharged