{"product_id":"high-flow-exhaust-manifolds-up-pipes-for-01-04-chevy-gmc-6-6l-duramax-diesel","title":"High Flow Exhaust Manifolds \u0026 Up Pipes for 01-04 Chevy GMC 6.6L Duramax Diesel","description":"\u003cp\u003eHigh-flow exhaust manifolds made from cast, high-sil moly and up-pipe bellows internally sleeved from aircraft-grade 304 stainless steel with increased inner diameter for higher flow designed for 2001–2004 Chevy and GMC 6.6L Duramax LB7 diesel engines. This kit improves exhaust flow to the turbocharger, reduces restriction, and restores reliable exhaust sealing. Ideal for replacing cracked manifolds, leaking up pipes, or restrictive factory components, this high flow exhaust manifold and up pipes kit supports better turbo efficiency, improved drivability, and long-term durability.\u003c\/p\u003e\n\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2001–2004 Chevrolet Silverado 2500HD, 2500, 3500HD, 3500 -- LB7\u003c\/li\u003e\n  \u003cli\u003e2001–2004 GMC Sierra 2500HD, 2500, 3500HD, 3500 -- LB7\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eProduct Details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManifolds:\u003c\/strong\u003e Cast, high-sil moly construction\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUp-Pipes:\u003c\/strong\u003e 11 gauge 304 stainless steel with internally sleeved aircraft-grade 304 stainless steel bellows and increased inner diameter\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlow Improvement:\u003c\/strong\u003e 53% greater flow over stock\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEmissions:\u003c\/strong\u003e 50 States Emissions Legal (E.O. D-701-34)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePerformance:\u003c\/strong\u003e Designed to maximize power and flow characteristics, lower exhaust gas temperatures (EGTs) and accelerate turbo spool-up while increasing power, fuel economy, and maintaining reliability\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Two exhaust manifold gaskets, two up-pipe to turbo gaskets, two up-pipe to manifold gaskets, and bolts\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCeramic Coating Option:\u003c\/strong\u003e Available to enhance the existing benefits of the high-flow exhaust manifold and up-pipes kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eThe factory downpipe (2001-2004 LB7 only) does not fit aftermarket manifolds and up-pipes—a separate aftermarket 3-inch down pipe is required. Installation requires removal of factory exhaust components and manifold mounting bolts; professional installation is recommended.\u003c\/p\u003e\n\n\u003cp\u003eCheck local emissions regulations before purchase. Professional installation is recommended.\u003c\/p\u003e\n\n\u003cp\u003eGet the right part the first time.\u003c\/p\u003e","brand":"Performance Parts Factory","offers":[{"title":"Default Title","offer_id":52915772621109,"sku":"GM-MQRMQL-0104","price":539.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0995\/5036\/3957\/files\/GM-MQRMQL-0104-1.webp?v=1780531598","url":"https:\/\/www.performancepartsfactory.com\/products\/high-flow-exhaust-manifolds-up-pipes-for-01-04-chevy-gmc-6-6l-duramax-diesel","provider":"Performance Parts Factory","version":"1.0","type":"link"}