1.5" Primary tube, ceramic coated finish. Hedman Elite heavy-duty headers are made with ultra heavy-duty, 14-gauge steel tubing. They feature a bulletproof 3/8 in. flange and their unpolished HTC thermal ceramic coating for intense heat conditions. Hedman Elite heavy-duty headers are designed to take the pounding and vibration of off-road conditions, as well as extreme hard use, the heat buildup found in motor homes during towing, and performance situations. Hedman Elite heavy-duty headers can take the abuse and keep on going when other brands fail. Unless otherwise noted, these headers are designed to fit the vehicle as it came from the manufacturer. This includes components like cylinder heads, chassis, steering, motor mounts, body mounts and bushings, etc. If your vehicle is using aftermarket components, parts from other applications, or custom altered parts, then it is the installer's responsibility to verify fitment.