Gibson GP400S Stainless Steel Performance Header 1.5 in. Tubing; Incl. Flanges/Gaskets Direct Fit bolt-on Replacement, No Welding Required, Uses OEM Style Connections Direct Fit bolt-on Replacement, No Welding Required, Uses OEM Style Connections Heavy Duty Laser Cut Port Flanges-No Warping or Leaking Premium Gaskets and Hardware Will Not Affect the Factory Warranty. Meets EPA and Carb Requirements