Take the hassle out of Coyote swapping your vintage Ford with the Doug's Header's 1 3/4" header system. 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 left unfinished (raw steel) for individual customizing