{"product_id":"exhaust-system-for-ford-f-150-2004-2008-4-2l-4-6l-5-4l","title":"Exhaust System for Ford F-150 (2004-2008) 4.2L 4.6L 5.4L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003e409 Stainless Steel Cat-Back Exhaust System for 2004-2008 Ford F-150 (P221)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This direct-fit 409 stainless steel exhaust system replaces the rusted extension pipe, intermediate pipe, muffler, and tail pipe behind the catalytic converter on \u003cstrong\u003eP221\u003c\/strong\u003e 2004-2008 Ford F-150 trucks equipped with the \u003cstrong\u003e4.2L\u003c\/strong\u003e, \u003cstrong\u003e4.6L\u003c\/strong\u003e, or \u003cstrong\u003e5.4L\u003c\/strong\u003e engine and a 145-inch wheelbase.\u003c\/p\u003e\u003ch3\u003eThe Stock Ford F-150 Exhaust Corrosion Failure\u003c\/h3\u003e\u003cp\u003eOn the eleventh-generation \u003cstrong\u003eP221\u003c\/strong\u003e Ford F-150 powered by the \u003cstrong\u003e4.2L Essex V6\u003c\/strong\u003e, \u003cstrong\u003e4.6L Modular V8\u003c\/strong\u003e, or \u003cstrong\u003e5.4L Triton V8\u003c\/strong\u003e, factory mild-steel piping traps condensation inside the muffler baffles and along welded hanger brackets. Thermal cycling from towing and daily driving accelerates intergranular rust at the extension and intermediate pipe slip joints. Once pinholes or seam splits form behind the converter, escaping exhaust gases create a sharp under-bed rasp, structural hanger fatigue, and potential downstream O2 sensor contamination triggering \u003cstrong\u003eP0420\u003c\/strong\u003e or \u003cstrong\u003eP0171\u003c\/strong\u003e faults.\u003c\/p\u003e\u003ch4\u003eCommon Symptoms of a Failing OEM Exhaust System\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Leaks \u0026amp; Fault Codes:\u003c\/strong\u003e Flange or pipe leaks near the front junction can disrupt rear O2 readings, risking \u003cstrong\u003eP0420\u003c\/strong\u003e\/\u003cstrong\u003eP0430\u003c\/strong\u003e catalyst efficiency or fuel trim codes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRattles \u0026amp; Under-Bed Rasp:\u003c\/strong\u003e Rotted internal muffler baffles and broken factory hanger welds produce metallic rattling at idle and loud rasp under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStructural Pipe Separation:\u003c\/strong\u003e Severe rust-through at the intermediate pipe or tail pipe allows hot exhaust gases to vent directly beneath the cab or bed.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit 409 Stainless Exhaust Solution\u003c\/h3\u003e\u003cp\u003eReplacing OEM reference \u003cstrong\u003eDAT000000597\u003c\/strong\u003e, this kit upgrades the factory routing with heavy-duty \u003cstrong\u003e409 stainless steel\u003c\/strong\u003e tubing formed via smooth mandrel bends to eliminate diameter pinch points. Factory-style welded hangers and precision-expanded slip joints ensure proper exhaust scavenging, zero cabin drone, and OE-level acoustic dampening for daily driving and light towing. Using the included heavy-duty U-clamps, the entire assembly bolts onto existing chassis mounts behind the factory catalytic converter without cutting, welding, or fabricating custom brackets.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 Extension Pipe\u003c\/li\u003e\n\u003cli\u003e1 Intermediate Pipe\u003c\/li\u003e\n\u003cli\u003e1 Tail Pipe\u003c\/li\u003e\n\u003cli\u003e1 Muffler\u003c\/li\u003e\n\u003cli\u003e5 U-Clamps\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2004-2008 Ford F-150 (145-Inch Wheelbase Only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e4.2L, 4.6L, 5.4L \/ P221\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEmissions \u0026amp; Substrate\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e409 Stainless Steel \/ Mandrel-Bent (Cat-Back)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eInstallation Type\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eDirect Bolt-On OEM Replacement (No Cutting or Welding)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eDAT000000597\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2004-2008 Ford F-150 4.2L (145-inch wheelbase only)\u003c\/li\u003e\n\u003cli\u003e2004-2008 Ford F-150 4.6L (145-inch wheelbase only)\u003c\/li\u003e\n\u003cli\u003e2004-2008 Ford F-150 5.4L (145-inch wheelbase only)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the P221 F-150?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e This is a direct fit for the 2004-2008 Ford F-150 equipped with the \u003cstrong\u003e4.2L\u003c\/strong\u003e, \u003cstrong\u003e4.6L\u003c\/strong\u003e, or \u003cstrong\u003e5.4L\u003c\/strong\u003e engine. \u003cstrong\u003eIt fits the 145-inch wheelbase configuration only; verify your door jamb wheelbase specification before ordering, as shorter or longer wheelbases are excluded.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eDoes this include a catalytic converter, and will it change exhaust volume?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eNo catalytic converter is included, and volume remains OE-quiet.\u003c\/strong\u003e This system replaces all piping and the muffler behind the factory converter, reusing your existing emissions hardware while maintaining factory sound levels without triggering \u003cstrong\u003eP0420\u003c\/strong\u003e\/\u003cstrong\u003eP0430\u003c\/strong\u003e catalyst codes.\u003c\/p\u003e\u003ch4\u003eAre mounting clamps included for installation?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Five U-clamps are included to secure the extension pipe, intermediate pipe, muffler, and tail pipe to the factory-style hangers with standard hand tools and zero welding.\u003c\/p\u003e\u003ch3\u003eThe Ford Heavy-Duty Standard\u003c\/h3\u003e\u003cp\u003eEngineered for \u003cstrong\u003eP221\u003c\/strong\u003e work trucks, this 409 stainless exhaust restores factory backpressure and thermal durability under sustained towing loads. Corrosion-resistant mandrel bends keep exhaust flow consistent through harsh road salt and moisture cycles.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68092068135160,"sku":"DS-EP2PIQJLZ","price":241.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/exhaust-system-for-ford-f-150-2004-2008-4-2l-4-6l-5-4l-1.jpg?v=1794596649","url":"https:\/\/performancechiptuning.com\/fr\/products\/exhaust-system-for-ford-f-150-2004-2008-4-2l-4-6l-5-4l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}