Excellent quality and durability to improve vehicle performance. Full length design for power gain from mid to high RPM range. Fully mandrel bent tubes made of high quality 16-gauge 304 stainless steel. Head flanges laser-cut from high quality 3/8-inch thick steel plates. The flange is flattened by a hydraulic press for precise and leak free sealing. All joints are golden color TIG brass style welded to prevent cracking and wear. Flanges chrome plated for corrosion resistance. Polished surface for extra protection against rusting. The accessories in the photos are included. No instructions provided; professional install recommended. Header Type: Long Tube / Full Length. Primary Diameter: 1-7/8 in. Collector Diameter: 3 in. Head Flange Thickness: 3/8 in. Pipe Thickness: 16 gauge (1.5mm). Material: 304 Stainless Steel. Te: The items you received are shown in the figure. If you have any questions later, please contact the after-sales staff in time. Please tap Read More for more details of the produc. Unless otherwise stated, all of our products are. For racing and track/off-road use. No emission compliance is provided. All of our products shall be used in accordance with any applicable local regulations and restrictions on road safety and exhaust emission. No install instructions are provided. Professional install is highly recommended. We shall not be liable for any consequences due to improper use of our products.