Megan racing headers are made with T-304 stainless steel, Mandrel bent tubing, CNC Machined Flanges. Each set is tested and dynoed to make sure the fitment and performance meet our goal. Each header comes with 1 year warranty. Spec: - 4-2-1 2 piece - T-304 Stainless Stee with Polish finish - Direct bolt on, gain more performance due to more air flow