BBK CNC-SERIES FULL-LENGTH HEADERS, CERAMIC-COATED, SET OF 2 -- 49-state legal; Not for sale or use in California; Cannot be shipped to California addresses; Provides additional power by 15 to 20 h.p.; 1.625 in. tube diameter, 3 in. flange collector, 16-gauge tube wall thickness, 0.375 in. standard head flange; Includes gaskets and hardware; Full-length style; Round head port; Feature CNC mandrel-bent tubing for unrestrictive airflow and 1-piece laser cut flange for added strength and durability; Dyno and pressure tested to ensure leak-free and maximum performance; Requires BBK short X-pipe or H-pipe; Easy direct bolt-on installation.