Mandrel-bent tubes provide consistent tubing diameters for smooth flow and increased exhaust velocity Heavy duty 16-gauge tubing for increased strength and durability Smooth transition, 1-3/4†diameter primary tubes are used for increased exhaust flow increasing performance and improving throttle response OE style 2-1/2†ball and socket collector connects to factory exhaust head pipe with no cutting or welding TIG-welded, machined 3/8†header flange for a leak-free seal and maximum strength Accommodates all factory OE components Premium aluminum header gaskets included Coated in high heat resistant black paint Headers are a must if you are using a cold air intake, cat-back exhaust system or tuner