{"product_id":"ap-exhaust-645399-catalytic-converter-left","title":"AP Exhaust 645399 Catalytic Converter - Left","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eAP Exhaust 645399 is a Federal \/ EPA direct-fit catalytic converter built to OE dimensions for a precise replacement. It uses a stainless steel body, a ceramic substrate, and a 2-bolt loose flange inlet with spherical flare for a factory-style exhaust connection.\u003c\/p\u003e\u003cp\u003eCompatible with Ford F-150 and Ford F-150 Heritage applications in the left position, this converter is listed for 2001-2004 models with the specified emissions and configuration notes. Part number 645399 is also identified by AP Exhaust as a direct-fit solution for exact fitment.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFederal \/ EPA direct-fit catalytic converter\u003c\/li\u003e\n\u003cli\u003eStainless steel body for corrosion resistance\u003c\/li\u003e\n\u003cli\u003eCeramic substrate material\u003c\/li\u003e\n\u003cli\u003e2 O2 sensor ports\u003c\/li\u003e\n\u003cli\u003e2-bolt loose flange inlet with spherical flare\u003c\/li\u003e\n\u003cli\u003e2.50-inch OD pipe outlet\u003c\/li\u003e\n\u003cli\u003eOutlet hardware included; inlet gasket not required\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Details\u003c\/h2\u003e\u003cp\u003eAP Exhaust 645399 is engineered around proprietary substrate chemistry and modern manufacturing methods to deliver efficient converter loading while maintaining OE dimensions and fitment. The design supports a clean, direct replacement path for Ford F-150 and Ford F-150 Heritage trucks that require the left-side converter configuration shown in the fitment data. The part number 645399 appears in AP Exhaust documentation as a direct-fit catalytic converter with a stainless steel shell and ceramic substrate for emissions service.\u003c\/p\u003e\u003cp\u003eThis part cross-references Monroe Shocks \u0026amp; Struts (e.g., 172286, 182286) for the same application.\u003c\/p\u003e\u003ch2\u003eWhat It Is Used For\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReplacing a worn or inefficient catalytic converter\u003c\/li\u003e\n\u003cli\u003eRestoring proper exhaust after emissions-related failure\u003c\/li\u003e\n\u003cli\u003eAddressing converter restriction or substrate breakdown\u003c\/li\u003e\n\u003cli\u003eCorrecting exhaust leaks at the inlet or outlet connection\u003c\/li\u003e\n\u003cli\u003eMaintaining direct-fit exhaust service on listed Ford trucks\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\u003cp\u003eFits 2001-2003 Ford F-150, left. Fits 2004 Ford F-150 Heritage, left. Fits 2004 Ford F-150 Heritage, left, with rear O2 sensor port between converter bodies and 2004 Old Body Style. Review the emissions notes carefully before installation, including Federal and California application restrictions listed in the fitment data. Part number 645399 uses a 2-bolt loose flange inlet with spherical flare and a 2.50-inch OD pipe outlet.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eAP Exhaust states that its manufacturing process uses automated workstations, spinner welding equipment, and high-speed production lines to maintain OE dimensions and fitment. The ARISTO substrate chemistry is used to support efficient converter loading and consistent production quality.\u003c\/p\u003e","brand":"AP Exhaust","offers":[{"title":"Default Title","offer_id":53370353221813,"sku":"BBDL-645399","price":594.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/AP_645399_Fro.jpg?v=1790140369","url":"https:\/\/www.partcatalog.com\/products\/ap-exhaust-645399-catalytic-converter-left","provider":"PartCatalog","version":"1.0","type":"link"}