{"product_id":"upgraded-3-304-stainless-downpipe-exhaust-for-2015-5-2016-lml-6-6l-duramax-diesel","title":"Upgraded 3\" 304 Stainless Downpipe Exhaust for 2015.5-2016 LML 6.6L Duramax Diesel","description":"\u003cp\u003e---tab Description---\u003c\/p\u003e\n\u003ch2\u003eUpgrade 3\" 304 Stainless Downpipe Exhaust | 2015.5-2016 GM 6.6L Duramax (LML)\u003c\/h2\u003e\n\u003cp\u003eUnlock the full breathing capacity of your LML Duramax’s turbocharger. This 3-inch performance downpipe is the single most effective hardware upgrade for 2015.5–2016 Chevrolet Silverado and GMC Sierra 2500HD\/3500HD trucks equipped with the 6.6L Duramax diesel engine.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb data-index-in-node=\"0\" data-path-to-node=\"9,0,0\"\u003eT304 Industrial-Grade Stainless Steel:\u003c\/b\u003e Built to withstand extreme heat cycles without cracking, warping, or corroding. Unlike cheaper 409-grade alternatives, our T304 construction ensures a lifetime of rust-free, high-performance durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb data-index-in-node=\"0\" data-path-to-node=\"9,1,0\"\u003eMassive 3-Inch High-Flow Design:\u003c\/b\u003e Significantly larger than the restrictive factory downpipe; this eliminates the primary \"cork\" at the turbocharger outlet for maximum exhaust velocity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb data-index-in-node=\"0\" data-path-to-node=\"9,2,0\"\u003eDrastically Lower EGTs:\u003c\/b\u003e Getting hot exhaust gases out of the turbo housing faster is critical for the LML platform. Lower EGTs protect your turbo internals, pistons, and head gaskets during heavy towing or high-boost operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb data-index-in-node=\"0\" data-path-to-node=\"9,3,0\"\u003eInstantaneous Turbo Spool-Up:\u003c\/b\u003e Reducing backpressure at the turbine exit minimizes turbo lag, giving you sharper, more immediate torque when you step on the pedal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb data-index-in-node=\"0\" data-path-to-node=\"9,4,0\"\u003ePerfect Chassis Clearance:\u003c\/b\u003e Custom-bent specifically for the tight engine bay clearances of the 2015.5+ GM chassis, ensuring no vibrations or contact against the firewall or drivetrain components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb data-index-in-node=\"0\" data-path-to-node=\"9,5,0\"\u003ePremium Heat Retention:\u003c\/b\u003e Engineered to provide optimal flow characteristics that help maintain exhaust energy needed for efficient VGT (Variable Geometry Turbo) operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan class=\"\"\u003eWhat’s New? Key Upgrades Over the Previous Model\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003ePremium 304 Stainless Steel Construction:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eWe've completely phased out the old 201 stainless steel and iron flanges, which were vulnerable to heat-induced rust and warping. The new system is built entirely from 304 stainless steel—offering unmatched resistance to heat, corrosion, and salt spray for a rock-solid, leak-proof seal that lasts.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eRace-Spec Black Heat Wrap:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eSay goodbye to the old linen-colored wrap that faded and crumbled over time. We've upgraded to a durable black fiberglass heat wrap that not only resists aging and peeling but also provides superior heat shielding. It keeps under-hood temperatures down and gives your setup a sleek, professional race-car look.\u003c\/span\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"MsoNormal\"\u003eShipping \u0026amp; Returns\u003c\/h2\u003e\n\u003ch3\u003eFree \u0026amp; Fast Shipping Policy\u003c\/h3\u003e\n\u003cp\u003eYour order will be dispatched within\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1-2 business days\u003c\/strong\u003e, and the package is expected to arrive by the estimated delivery date.\u003cspan\u003e \u003c\/span\u003e\u003ca rel=\"noopener\" href=\"https:\/\/dpfexhaust.com\/pages\/copy-of-shipping-policy\" target=\"_blank\"\u003eClick for Shipping Policy.\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFree \u0026amp; Easy Return Policy\u003c\/h3\u003e\n\u003cp\u003eEvery order comes with a\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e14-day free return\u003c\/strong\u003e, which means you don't have to pay for a return slip.\u003cspan\u003e \u003c\/span\u003e\u003ca rel=\"noopener\" href=\"https:\/\/dpfexhaust.com\/pages\/refund-policy\" target=\"_blank\"\u003eClick for Return Policy.\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"\"\u003e---tab Fitment---\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan class=\"\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,0,0\"\u003e2015.5–2016 Chevrolet Silverado 2500HD \/ 3500HD\u003c\/b\u003e (6.6L Duramax LML)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"\"\u003e\u003cb data-index-in-node=\"0\" data-path-to-node=\"17,1,0\"\u003e2015.5–2016 GMC Sierra 2500HD \/ 3500HD\u003c\/b\u003e (6.6L Duramax LML)\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DPFexhaust","offers":[{"title":"Black","offer_id":50568133607647,"sku":"#12114","price":189.99,"currency_code":"USD","in_stock":true},{"title":"Silver","offer_id":50568133640415,"sku":"#12115","price":179.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0752\/1789\/5647\/files\/01_e9a2ba3c-5025-4b67-933c-27e5bf6e3cea.webp?v=1784001437","url":"https:\/\/dpfexhaust.com\/products\/upgraded-3-304-stainless-downpipe-exhaust-for-2015-5-2016-lml-6-6l-duramax-diesel","provider":"DPFexhaust","version":"1.0","type":"link"}