PACESETTER HEADERS, BLACK-PAINTED -- Full-Length Headers, 1.5 in. Primary Tubing Diameter, 16-Gauge Primary Tube Wall Thickness, 2.5 in. Stock Flange Collector, 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, Comes With Header Extension To Connect To Stock System, Fabrication May Be Required, 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, Comes With Gasket, Reducers, And 0.375 in. Standard Head Flange, With Pacesetter's 3-Year Warranty