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: - Fits 01-04 Civic EX - 4-1 1 piece - 2.25" outlet - T-304 Stainless Stee with Polish finish - Direct bolt on, gain more performance due to more air flow