All Necessary Hardware, Bolts, and Gasket Included. In stock. All made by stainless steel.flange also made by stainless steel. exhaust header for 04-06 PONTIAC GTO 5.7/6.0 V8 STAINLESS STEEL EXHAUST 4-1 Compatible with: 04-06 Pontiac GTO 5.7L 6.0L V8 Specifics and Features: Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends i.e. Maximizing Smoothest Exhaust Airflow High Performance 4-1 Racing Design TIG Welded CNC Machine Flange for Strength and Durability Inlet/ Outlet Sizes: 1-5/8"OD / 2-1/2" OD Piping Diameter: 1-5/8" Increase Engine Output and Efficiency Gain 10 - 15 HPs Bolt(s) and Metal Gasket(s) Included Direct Bolt-On Installation, Requires NO Modification 100% Brand New Professional Installer is Highly Recommended (No Instruction Included) Includes: 1 X Pair of Exhaust Header Manifolds Installation Hardware as Shown Notes Year Make Model Trim Engine 2006 Pontiac GTO Base Coupe 2-Door 6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated 2005 Pontiac GTO Base Coupe 2-Door 6.0L 5967CC 364Cu. In. V8 GAS OHV Naturally Aspirated 2004 Pontiac GTO Base Coupe 2-Door 5.7L 350Cu. In. V8 GAS OHV Naturally Aspirated
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