{"product_id":"2011-2015-6-6l-chevrolet-chevy-gmc-lml-gm-duramax-turbo-diesel-3inch-downpipe-exhaust","title":"2011-2015.5 Chevy\/GMC 6.6L Duramax LML Turbo Diesel 3Inch Downpipe Exhaust","description":"\u003c!-- more --\u003e\n\u003ch4\u003eFITMENT\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e2011-2015.5 6.6L Silverado \u0026amp; Sierra Duramax 2500HD\/3500HD with LML Diesel engine pickup.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThis downpipe features a V-Band connection flange at the turbo outlet.\u003c\/li\u003e\n\u003cli\u003eNOT directly fit 2015.5-2016 models with the 3-bolt flange exhaust system unless the downstream system is modified.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eDESCRIPTION\u003c\/h4\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003cb\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cmeta charset=\"utf-8\"\u003eThe factory downpipe on 11-15.5 Duramax LML trucks is a major performance bottleneck. To squeeze past tight engine bay clearances, GM engineers severely crushed and flattened the stock pipe.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThis restricted \"pancake\" design chokes exhaust flow, traps excessive thermal energy right at the turbo charger, and spikes EGTs under heavy towing loads.\u003c\/li\u003e\n\u003cli\u003eUpgrading to smooth, 3-inch mandrel-bent downpipe maximizes exhaust flow right from the turbo outlet, rapidly dropping EGTs and allowing the turbo to spool up much faster.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e\u003cspan data-type=\"text\"\u003e\u003cspan data-type=\"leaf\"\u003eKey Features\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHeavy-Duty Wrapped Protection: Crafted from high-grade 304 stainless steel and wrapped in premium heat-insulating sleeve to safeguard surrounding engine bay components.\u003c\/li\u003e\n\u003cli\u003eTIG-Welded Construction: All joints are precision TIG welded and jig-built to prevent cracking under high thermal cycling and aggressive vibration.\u003c\/li\u003e\n\u003cli\u003eUnrestricted 3\" Bore: Replaces the restrictive, \"crushed\" factory oval pipe with a true, consistent 3“ mandrel-bent round diameter through every turn.\u003c\/li\u003e\n\u003cli\u003eDrastic EGT Reduction: Smooths out exhaust flow to quickly draw extreme heat away from the turbo, reducing under-hood temperatures and protecting engine health.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFAQ\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this fit my 2015 or 2016 model?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: It fits 11-15.5 models that use a V-band style turbo connection. In 15.5-16, GM switched the LML to a \u003cspan style=\"text-decoration: underline;\"\u003e\u003cspan style=\"color: rgb(43, 0, 255); text-decoration: underline;\"\u003e\u003ca href=\"https:\/\/www..com\/products\/-2015-2016-lml-6-6l-duramax-diese-3-inch-downpipe-exhaust\" title=\"3-bolt flange style downpipe\" style=\"color: rgb(43, 0, 255); text-decoration: underline;\" rel=\"noopener\" target=\"_blank\"\u003e3-bolt flange style downpipe\u003c\/a\u003e\u003c\/span\u003e\u003c\/span\u003e. Please inspect your truck's connection before buying.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this pipe have the necessary sensor ports?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes. Unlike older generations, the LML downpipe requires sensor ports. This downpipe is precision-engineered with 3 factory-location bungs to house your stock EGT sensor, NOx sensor, and 9th injector dosing valve flawlessly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What happens to the sensor bungs if I delete my truck?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: If you are doing an emissions delete and removing these sensors, you must buy a standard LML downpipe plug kit (or sourcing matching bolts\/plugs) to cap the 3 bungs off so exhaust gas doesn't leak out.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this 3\" downpipe work with my stock exhaust or an aftermarket 4\"\/5\" delete pipe?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: \u003cmeta charset=\"utf-8\"\u003eYes, it fits both perfectly. The OEM-matched flanges bolt directly to the stock turbo and factory exhaust. If you upgrade to a \u003ca href=\"https:\/\/www..com\/products\/-2011-2016-6-6l-duramax-lml-4-5-dp-back-dpf-egr-delete-kit\" title='4\" or 5\" delete pipe,' rel=\"noopener\" target=\"_blank\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cspan style=\"color: rgb(43, 0, 255); text-decoration: underline;\"\u003e4\" or 5\" delete pipe\u003c\/span\u003e\u003c\/span\u003e,\u003c\/a\u003e it still fits flawlessly—all downpipe-back systems neck down to bolt directly to this factory location without adapters.\u003c\/p\u003e","brand":"True American Diesel","offers":[{"title":"Default Title","offer_id":47261111681212,"sku":"DP-0013","price":268.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/4101\/8044\/files\/2_45578ae1-afa6-4a73-9183-74b2cebe654b.jpg?v=1786464495","url":"https:\/\/trueamericandiesel.com\/products\/2011-2015-6-6l-chevrolet-chevy-gmc-lml-gm-duramax-turbo-diesel-3inch-downpipe-exhaust","provider":"TrueAmericanDiesel","version":"1.0","type":"link"}