Stainless Steel T304 4-1 Exhuast Header/Manifold for 05-10 Chevy Cobalt ION HHR GM Made of high quality T-304 stainless steel material TIG welded CNC machine flange 4-1 Racing design 2.2L/ 2.4L I4 Non-Turbo/ Non-Turbocharged Models ONLY Increase high flow air, instantly gain 10 to 15 horsepower or torque