PACESETTER HEADERS, STEEL, BLACK-PAINTED -- 1.625 in. tube diameter, 16-gauge tube wall thickness, 2 in. slip-fit collector, 0.375 in. standard head flange; Gasket, reducer, and header extension included to connect to stock system; Full-length style; These easy-to-clean headers feature mandrel-bent mild steel primary tubing that is black-painted to reduce underhood temperature and to resist rust and corrosion; They significantly boost performance and increase engine efficiency; Hook-ups for smog and engine management sensors; Not legal for use on catalyst-equipped vehicles except for racing vehicles which may not be operated on a highway; Pre-catalyst vehicles must use original emission control devices; It is the responsibility of the customer to reinstall these devices on the vehicle; With Pacesetter's 3-year warranty.