Doug's Headers 1 3/4" 4-Tube Full Length D-Port Headers Pontiac GTO/Lemans/Tempest  (A-body) 326-455 64-67 Metallic Ceramic Coating

3/8" Thick machined flanges... no warping CNC mandrel bent tubes... accurate fit & better flow Precision formed long transition collectors and long tube design... reduces backpressure and increases higher RPM horsepower Heavy 16 gauge tubing... longer life Tubes are pre-polished to remove scratches and the header is finished with a Metallic Ceramic Thermal Barrier Coating polished to a high luster appearance offering corrosion and heat resistance up to 1400 degrees Doug's COATED(-C) Headers come with a ceramic heat barrier and rust proof coating (polished aluminum color)