Very clean BTM catback kit, guaranteed free of leaks and any issues. Exhaust tip size is 3 inches. Exhaust tip valve thickness is 4 mm (thicker than usual valve thicknesses). Benefit: stronger resistance to backfire and impacts. BTM catback with electronic valve, 3 inches. 304 Steel. Increases engine performance and horsepower. Compatible with Sierra and Silverado models from 2007-2018.