Doug Thorley Headers thy-309-c Exhaust Header for GM Truck/SUV 4.8L, 5.3L, 6.0L, 6.2L Made in the USA with limited lifetime warranty Extra thick 14GA tubing and 3/8 inch thick flanges Ceramic coated inside and out Kit includes all required gaskets and/or installation hardware CARB approved, 50 state smog legal