{"product_id":"4-5-downpipe-back-exhaust-for-2001-2007-lb7-lly-lbz-6-6-duramax-race-pipe","title":"4\"\/5\" Downpipe Back for 2001-2007 LB7 LLY LBZ 6.6 Duramax Race Exhaust","description":"\u003cp\u003e\u003cspan class=\"15\"\u003e---tab Description---\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\n\u003cspan class=\"15\"\u003e2001-2007 LB7 LLY LBZ\u003c\/span\u003e\u003cspan class=\"15\"\u003e \u003c\/span\u003e\u003cspan class=\"15\"\u003eDuramax \u003c\/span\u003e\u003cspan class=\"15\"\u003e4\"\/5\" Downpipe Back Race Exhaust 6.6 Duramax\u003c\/span\u003e\n\u003c\/h2\u003e\n\u003cp\u003e\u003cspan class=\"15\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0752\/1789\/5647\/files\/dpf_pipe_style7.webp?v=1761810681\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eTake your 2001-2004 LB7, 2004-2005 LLY and 2006-2007 LBZ Duramax diesel one step further w\u003cspan style=\"font-size: 0.875rem;\"\u003eith our downpipe back race exhaust. \u003cspan\u003eThis pipe replaces the OE exhaust from the downpipe back to reduce restriction and improve exhaust flow. The 5'' diameter pipe helps lower backpressure, supporting better turbo response and more consistent power delivery. \u003c\/span\u003e\u003cstrong\u003eFor off-road and race use only.\u003c\/strong\u003e\u003c\/span\u003e\u003cspan class=\"15\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"15\"\u003eKey Features\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan class=\"15\"\u003e\u003cstrong\u003e4-Inch High-Velocity Flow:\u003c\/strong\u003e Replaces the aging, narrow 3-inch factory piping with a high-volume 4-inch straight path, drastically reducing exhaust backpressure.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"15\"\u003e\u003cstrong\u003eMassive Reduction in EGTs:\u003c\/strong\u003e Crucial for modified LB7s; dumping hot exhaust gases faster protects your turbocharger, pistons, and head gaskets from heat-related thermal fatigue under heavy hauling.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"15\"\u003e\u003cstrong\u003eQuicker Turbo Spool-Up:\u003c\/strong\u003e Removing downstream restrictions allows your factory or aftermarket turbocharger to spool up significantly faster, curing low-end lag and sharpening your throttle response.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"15\"\u003e\u003cstrong\u003eUnleash the Duramax V8 Rumble: \u003c\/strong\u003eDelivers a deep, aggressive, and unmistakable V8 diesel growl that the LB7 is known for, without the excessive cabin resonance found in poorly designed systems.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"15\"\u003e\u003cstrong\u003eOptimized Engine Efficiency:\u003c\/strong\u003e Allowing the engine to pump out waste gases with zero resistance translates to better engine efficiency and improved overall performance during towing.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"15\"\u003e\u003cstrong\u003eIndustrial Mandrel-Bent Steel:\u003c\/strong\u003e Features smooth, unwrinkled curves throughout the entire line to guarantee zero neck-down or restriction points, preserving high exhaust velocity.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp class=\"p\"\u003eThis race exhaust kit is available in 4-inch or 5-inch diameter options, and is made of T-409 stainless steel to provide durability for daily driving and rough long haul conditions. With a 2mm thick wall, this kit is designed to handle high heat and rugged use without breaking a sweat. T-409 has a slight magnetic property.\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan class=\"15\"\u003e\u003cspan\u003eThis kit includes band clamps, hangers, and all required installation hardware. It is designed for off-road or race use only, with no sensor bungs included.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p\"\u003e\u003cspan class=\"15\"\u003e\u003cspan\u003e5-inch system allows more airflow and is louder than the 4-inch pipe; a muffler can be added if reduced exhaust noise is preferred. (Available in bundle product)\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eYou need to pair it with race tuning for peak performance (available in bundle product). The package includes all essential clamps and hardware for a bolt-on installation with basic tools. For optimal outcomes, professional installation is advised.\u003c\/p\u003e\n\u003ch2\u003eShipping \u0026amp; Returns\u003c\/h2\u003e\n\u003ch3\u003e\n\u003cspan\u003eFast \u0026amp; Free Shipping Policy\u003c\/span\u003e\u003cb\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/b\u003e\n\u003c\/h3\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003eYour order will be dispatched within \u003c\/span\u003e\u003cb\u003e\u003cspan class=\"16\"\u003e\u003cspan\u003e1-2 business days\u003c\/span\u003e\u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003e, and the package will arrive within your order's estimated date. \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/dpfexhaust.com\/pages\/copy-of-shipping-policy\"\u003e\u003cu\u003e\u003cspan class=\"15\"\u003eClick for Shipping Policy.\u003c\/span\u003e\u003c\/u\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"p\"\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eEasy \u0026amp; Free Return Policy\u003c\/span\u003e\u003cb\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/b\u003e\n\u003c\/h3\u003e\n\u003cp class=\"p\"\u003e\u003cspan\u003eEvery order comes with a \u003c\/span\u003e\u003cb\u003e\u003cspan class=\"16\"\u003e\u003cspan\u003e14-day free return\u003c\/span\u003e\u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003e, which means you don't have to pay for a return slip. \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/dpfexhaust.com\/pages\/refund-policy\"\u003e\u003cu\u003e\u003cspan class=\"15\"\u003eClick for Return Policy.\u003c\/span\u003e\u003c\/u\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"15\"\u003e---tab Fitment---\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"15\"\u003eFitment\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e2001-2007 Chevrolet Silverado \/ GMC Sierra 6.6L Duramax LB7 LLY LBZ 2500HD 3500HD\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003c\/strong\u003e*Does not fit Cab \u0026amp; Chassis trucks.\u003c\/p\u003e\n\u003cp\u003e---tab FAQ---\u003c\/p\u003e\n\u003ch2\u003eFAQs\u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003eQ: What does \"DP-back\/Downpipe-back\" mean?\u003cbr\u003e\u003c\/strong\u003eA: This means the exhaust system will replace the OE exhaust from the downpipe all the way to the end of the exhaust pip. This typically includes the mid-pipe, catalytic converter (if present), and muffler.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003eQ: What is your race exhaust made from? Stainless steel or aluminum?\u003cbr\u003e\u003c\/strong\u003eA: They are made of 409 stainless steel.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003eQ: Does your race exhaust kit need me to purchase additional parts?\u003cbr\u003e\u003c\/strong\u003eA: Our exhaust kit comes with all the parts. Normally, there is no need to purchase anything else.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003eQ: Does your Dp-back pipe work with stock parts?\u003cbr\u003e\u003c\/strong\u003eA: Yes, our DP-back pipe can fit perfectly with the stock Downpipe and stock bolts.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cstrong\u003eQ: Will this exhaust fit cab and chassis models?\u003cbr\u003e\u003c\/strong\u003eA: No. The Cab \u0026amp; Chassis has a relatively longer chassis and requires a tube specifically designed to fit the Cab \u0026amp; Chassis model. For further assistance, please reach out to our \u003ca href=\"mailto:service@dpfexhaust.com\" rel=\"noopener\" target=\"_blank\"\u003ecustomer service\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp class=\"p\"\u003e \u003c\/p\u003e","brand":"DPFexhaust","offers":[{"title":"4'' Downpipe-Back Exhaust","offer_id":46935302209759,"sku":"#10125","price":430.0,"currency_code":"USD","in_stock":true},{"title":"5'' Downpipe-Back Exhaust w\/Muffler","offer_id":46935302308063,"sku":"#10126","price":485.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0752\/1789\/5647\/files\/DPF-ES08060_29f37dfa-a95b-47c2-ba24-098cccb7ca6c.jpg?v=1747737391","url":"https:\/\/dpfexhaust.com\/products\/4-5-downpipe-back-exhaust-for-2001-2007-lb7-lly-lbz-6-6-duramax-race-pipe","provider":"DPFexhaust","version":"1.0","type":"link"}