{"product_id":"2004-5-2010-lly-lbz-lmm-6-6l-duramax-diesel-3-downpipe-exhaust-1","title":"2004.5-2010 LLY LBZ LMM 6.6L Duramax Diesel 3\" Downpipe Exhaust","description":"\u003c!-- more --\u003e\n\u003ch4\u003eFITMENT\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e2004.5-2010 \u003cmeta charset=\"utf-8\"\u003e6.6L Silverado \u0026amp; Sierra \u003cmeta charset=\"utf-8\"\u003eDuramax 2500HD \/ 3500HD Diesel engine.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCompatible Engine Codes: LLY (2004.5-2005) \/ LBZ (2006-2007) \/ LMM (2007.5-2010).\u003c\/li\u003e\n\u003cli\u003eDesigned for use with OEM stock turbochargers or factory-style drop-in upgraded turbos.\u003cbr\u003e\n\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 class=\"MsoNormal\"\u003eAging 2004.5-2010 Duramax LLY\/LBZ\/LMM trucks suffer from a severe factory bottleneck—the notorious \"crushed-oval\" downpipe. This flattened design acts like a brick wall, trapping intense backpressure right behind the turbo, spiking EGTs under load, and choking potential horsepower.\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eUpgrading to a smooth, mandrel-bent 3\" round downpipe is a game-changer. It eliminates the stock restriction, unlocking instant throttle response, faster turbo spool-up, and cooler operational temperatures while giving your V8 that deep, aggressive rumble it deserves.\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 Construction: Engineered from high-grade T304 stainless steel to resist rust and withstand intense thermal cycling under heavy towing loads.\u003c\/li\u003e\n\u003cli\u003ePrecision Engineered: Mandrel-bent 3\" inlet and 3\" outlet match stock connection points flawlessly for a leak-free seal.\u003c\/li\u003e\n\u003cli\u003eClean Bung-less Design: No unnecessary sensor ports to plug, perfectly matching the original factory setup for these model years.\u003c\/li\u003e\n\u003cli\u003eRigid Design: Replaces the flexible factory section entirely, utilizing the turbo's V-band clamp to accommodate normal engine movement without stress.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFAQ\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why should I replace my factory downpipe?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The factory unit is a known failure point; its bellows-style flex section regularly cracks, causing exhaust leaks. Furthermore, it uses restrictive crush-bending that shrinks the internal diameter at the turns. Our mandrel-bent pipe maintains a true, unrestrictive 3\" bore through every bend.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this work with my stock DPF exhaust?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Yes. The 3\" outlet matches the factory connection point perfectly. You can install this downpipe as a standalone reliability upgrade without changing any other part of your emissions or exhaust system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this downpipe increase horsepower?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: On its own, expect a modest gain of 5-10 horsepower. However, when paired with a delete pipe and a custom tune, its efficiency multiplies. The primary benefits are eliminating the factory leak point and significantly improving turbo spool response.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does it have sensor bungs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No,\u003cmeta charset=\"utf-8\"\u003e The factory 04.5-10 Duramax LLY, LBZ, and LMM engines do not have sensors on the stock downpipe; they are located on the exhaust manifold and downstream components. Our clean, bungless design ensures a true plug-and-play factory replacement.\u003c\/p\u003e","brand":"True American Diesel","offers":[{"title":"Default Title","offer_id":47261109846204,"sku":"DP-0185","price":269.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/4101\/8044\/files\/1_7bcc7080-9a3f-4831-a3d5-d90a972a5e8c.jpg?v=1786464457","url":"https:\/\/trueamericandiesel.com\/products\/2004-5-2010-lly-lbz-lmm-6-6l-duramax-diesel-3-downpipe-exhaust-1","provider":"TrueAmericanDiesel","version":"1.0","type":"link"}