Exhaust Header. 98 F150,F250 4.5L 2 & 4 WD- BLACK MAXX. 1997-2003 Ford Expedition 5.4 Liter, 1997-2002 Ford Expedition 5.4 Liter Naturally Aspirated GAS, 1997-2003 Ford F-150 5.4 Liter, 2001 Ford F-150 5.4 Liter Naturally Aspirated GAS, 1997-2001 Ford F-250 5.4 Liter, 2000-2001 Ford F-250 5.4 Liter Naturally Aspirated GAS. Y-Pipe Included. No. with EGR. No. with A.I.R. System. No. Y-Pipe Included. Package Contents. One pair of headers, head flange gaskets, collector flange gaskets (when applicable), 3-bolt exhaust adapters, mounting hardware. Installation Hardware Included. Yes. Gasket #. 27450. Cylinder Head. Stock Profile Heads. Transmission Mount/Crossmember Included. No. Quantity. Sold as a pair.. Motor Mounts Included. NO. Crossover Pipe Included. NO. Catalytic Converter(s) Included. No. Weld-Up. No. Tuned. NO. Primary Tube Gauge. 16g.