Manufactured using mandrel-bent, mild steel tubing and surface-ground, thick steel flanges, PaceSetter Headers are available with standard black painted finish or Armor*Coat, a polished, 2000 Degree F, metallic-ceramic coating. Each header undergoes an extensive preparation phase followed by two applications of the coating and a high-temp curing process. The Armor*Coat won't discolor like paint, chrome or dull finish coating, reduces underhood temperatures, resists rust and corrosion and is easy to keep clean. All PaceSetter Headers come with hardware, gaskets and illustrated instructions and are backed by a three-year warranty. Header bolts not included. All Mid-Tube Headers are engineered to deliver the most performance gain while retaining all required pollution control and engine management hook ups, including the stock or stock-replacement catalytic converters. All headers use 3/8", CNC-machined flanges, mandrel-bent 16-gauge steel tubing and include all gaskets, hardware and tubing necessary to install and connect to stock catalytic converter. Specifications: Primary Diameter: 1-5/8" 50 State Legal Note: Picture is for reference only.