Horse Power Gain: +7.87 hp, Torque Gain: +12.03 lbs. Excellent quality and durability to improve vehicle performance. Shorty design for power gain from idle to mid-range RPM. Fully mandrel bent tubes made of high quality 16-gauge 409 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. Mandrel bent pipes to maintain free flow. The accessories in the photos are included. No instructions provided; professional install recommended. Note: The items you received are shown in the figure. If you have any questions later, please contact the after-sales staff in time.