{"product_id":"3-5-downpipe-exhaust-for-2017-2024-l5p-6-6l-duramax-diesel-black-spelab","title":"3.5'' Downpipe Exhaust For 2017-2024 L5P 6.6L Duramax Diesel Black| SPELAB","description":"\u003cp\u003e---tab Description---\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThis 3.5\" turbocharger downpipe will increase exhaust flow, improving performance.  \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"240\" data-end=\"678\"\u003eMade with mandrel-bent 3.5-inch stainless steel tubing and coated in a ceramic black finish, this SPELAB high-performance L5P downpipe significantly improves airflow, reduces EGTs, and enhances turbocharger response. It’s the ideal component to begin building a full \u003cstrong data-start=\"639\" data-end=\"670\"\u003eL5P Duramax downpipe delete\u003c\/strong\u003e system.\u003c\/p\u003e\n\u003cp data-start=\"680\" data-end=\"855\"\u003eWhether you're replacing a restrictive stock pipe or upgrading for tuning purposes, this \u003cstrong data-start=\"769\" data-end=\"789\"\u003eDuramax downpipe\u003c\/strong\u003e delivers the gains you expect in both performance and durability.\u003c\/p\u003e\n\u003ch3 data-start=\"680\" data-end=\"855\"\u003eBlack or Silver?\u003c\/h3\u003e\n\u003cp\u003eAt SPELAB, our Standard Silver Stainless Steel Downpipe has long been the \"Best Seller\" and the go-to choice for truck owners, thanks to its exceptional value and time-tested reliability. \u003cstrong\u003eIf you are looking for a solid performance boost with a clean, factory-style finish, the Silver variant remains your most dependable partner on the road.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFor enthusiasts seeking ultimate heat management and a premium custom look, our \u003cspan style=\"color: rgb(255, 42, 0);\"\u003eBlack Ceramic Coated\u003c\/span\u003e takes performance to the next level:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior Thermal Control:\u003c\/strong\u003e The advanced ceramic coating effectively traps heat within the pipe, reducing under-hood temperatures and ensuring quicker turbo spool-up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll-Weather Protection: \u003c\/strong\u003eEspecially in harsh environments or salted road conditions, the ceramic layer acts as an extra shield, providing superior resistance to corrosion and rust.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSleek Aesthetics: \u003c\/strong\u003eThe deep matte black finish adds a professional, high-performance visual impact to your engine bay.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003eApplication:  Downpipe Exhaust\u003cbr\u003eMaterial: Stainless Steel\u003cbr\u003eSurface: Mirror Polish\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"2522\" data-end=\"2604\"\u003e\n\u003cstrong data-start=\"2525\" data-end=\"2541\"\u003eComplete Kit\u003c\/strong\u003e: Includes \u003ca title=\"downpipe exhaust\" href=\"https:\/\/www.spelabautoparts.com\/collections\/downpipe-exhaust\"\u003edownpipe\u003c\/a\u003e, heat wrap, clamps, and precision flanges\u003c\/li\u003e\n\u003cli data-start=\"2607\" data-end=\"2688\"\u003e\n\u003cstrong data-start=\"2610\" data-end=\"2635\"\u003eSuperior Heat Control\u003c\/strong\u003e: Minimizes heat soak and improves turbo efficiency\u003c\/li\u003e\n\u003cli data-start=\"2691\" data-end=\"2784\"\u003e\n\u003cstrong data-start=\"2694\" data-end=\"2708\"\u003eDirect Fit\u003c\/strong\u003e: Designed to replace the \u003cstrong data-start=\"2734\" data-end=\"2755\"\u003e2018 L5P downpipe\u003c\/strong\u003e without cutting or welding\u003c\/li\u003e\n\u003cli data-start=\"2787\" data-end=\"2866\"\u003e\n\u003cstrong data-start=\"2790\" data-end=\"2809\"\u003eCeramic Coating\u003c\/strong\u003e: Sleek finish with high resistance to corrosion and heat\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eOE vs. SPELAB Downpipe Comparison\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eStock Downpipe\u003c\/th\u003e\n\u003cth\u003eSPELAB 3.5\" Downpipe\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePipe Diameter\u003c\/td\u003e\n\u003ctd\u003eNarrow, restrictive\u003c\/td\u003e\n\u003ctd\u003eLarge 3.5-inch high-flow mandrel bent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSurface Protection\u003c\/td\u003e\n\u003ctd\u003eBare metal, prone to rust\u003c\/td\u003e\n\u003ctd\u003eBlack ceramic coating, high-temp and anti-corrosive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeld Quality\u003c\/td\u003e\n\u003ctd\u003eSpot-welded, uneven\u003c\/td\u003e\n\u003ctd\u003ePrecision full TIG-welded flanges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Management\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003ctd\u003eIncludes thermal wrap + stainless clamps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlow Efficiency\u003c\/td\u003e\n\u003ctd\u003eHigh backpressure, turbo lag\u003c\/td\u003e\n\u003ctd\u003eSmooth, unrestricted flow—ideal for \u003cstrong\u003eL5P downpipe delete\u003c\/strong\u003e builds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eWhat's the Difference Between a Downpipe and an Exhaust?\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eComponent\u003c\/th\u003e\n\u003cth\u003eFunction Description\u003c\/th\u003e\n\u003cth\u003eLocation\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDownpipe\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eConnects turbo outlet to mid-pipe; manages hot gas flow\u003c\/td\u003e\n\u003ctd\u003eImmediately after the turbocharger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eExhaust System\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMid-section to tailpipe; reduces noise and handles emissions\u003c\/td\u003e\n\u003ctd\u003eFrom downpipe to tailpipe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eUpgrading the downpipe = performance and throttle response\u003cbr data-start=\"1462\" data-end=\"1465\"\u003eUpgrading the exhaust = tone, flow, and backpressure control\u003c\/p\u003e\n\u003cp\u003e---tab Fitment---\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003e2017-2024\u003c\/span\u003e Chevrolet Silverado \u0026amp; GMC Sierra 2500 \u0026amp; 3500HD 6.6L Duramax pickup trucks.\u003c\/li\u003e\n\u003cli\u003eWill not fit Cab \u0026amp; Chassis trucks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e---tab FAQ---\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat does a downpipe do?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe downpipe on your turbocharged vehicle is directing the exhaust gases out of the turbine housing into the exhaust system. An aftermarket downpipe will typically be larger in diameter and either uses a high-flowing catalytic converter or remove the catalytic converter altogether.\u003c\/p\u003e\n\u003cp\u003eBy removing the factory downpipe and replacing it with a high flowing unit you are allowing the turbo to more efficiently move gases away from the turbine which creates more power. Since the factory restrictions are now gone you can increase the boost on the vehicle as the factory downpipe is a choking point for performance.\u003c\/p\u003e\n\u003cp data-start=\"3204\" data-end=\"3473\"\u003e\u003cstrong data-start=\"3204\" data-end=\"3254\"\u003eQ1: Is this SPELAB downpipe catless or catted?\u003c\/strong\u003e\u003cbr data-start=\"3254\" data-end=\"3257\"\u003e\u003cstrong data-start=\"3257\" data-end=\"3263\"\u003eA:\u003c\/strong\u003e This is a \u003cstrong data-start=\"3274\" data-end=\"3294\"\u003ecatless downpipe\u003c\/strong\u003e, meaning it does not contain a catalytic converter. It’s designed for maximum exhaust flow and performance—ideal for off-road and race-use \u003cstrong data-start=\"3434\" data-end=\"3465\"\u003eL5P Duramax downpipe delete\u003c\/strong\u003e builds.\u003c\/p\u003e\n\u003cp data-start=\"3480\" data-end=\"3780\"\u003e\u003cstrong data-start=\"3480\" data-end=\"3551\"\u003eQ2: What is the difference between a catted and a catless downpipe?\u003c\/strong\u003e\u003cbr data-start=\"3551\" data-end=\"3554\"\u003e\u003cstrong data-start=\"3554\" data-end=\"3560\"\u003eA:\u003c\/strong\u003e A \u003cstrong data-start=\"3563\" data-end=\"3582\"\u003ecatted downpipe\u003c\/strong\u003e includes a high-flow catalytic converter and is more emissions-friendly, while a \u003cstrong data-start=\"3664\" data-end=\"3684\"\u003ecatless downpipe\u003c\/strong\u003e removes restrictions completely for maximum performance. SPELAB’s 3.5-inch downpipe is catless.\u003c\/p\u003e\n\u003cp data-start=\"3787\" data-end=\"4010\"\u003e\u003cstrong data-start=\"3787\" data-end=\"3844\"\u003eQ3: Do I need a tuner after installing this downpipe?\u003c\/strong\u003e\u003cbr data-start=\"3844\" data-end=\"3847\"\u003e\u003cstrong data-start=\"3847\" data-end=\"3853\"\u003eA:\u003c\/strong\u003e If you’re using it as part of an \u003cstrong data-start=\"3887\" data-end=\"3910\"\u003eL5P downpipe delete\u003c\/strong\u003e or DPF removal system, a tuner is required to prevent check engine lights and optimize performance.\u003c\/p\u003e\n\u003cp data-start=\"3787\" data-end=\"4010\"\u003e\u003cstrong data-start=\"4017\" data-end=\"4066\"\u003eQ4: Which model years does this downpipe fit?\u003c\/strong\u003e\u003cbr data-start=\"4066\" data-end=\"4069\"\u003e\u003cstrong data-start=\"4069\" data-end=\"4075\"\u003eA:\u003c\/strong\u003e It fits all 2017–2024 L5P 6.6L Duramax trucks, including those needing a \u003cstrong data-start=\"4149\" data-end=\"4170\"\u003e2018 L5P downpipe\u003c\/strong\u003e replacement.\u003c\/p\u003e\n\u003cp data-start=\"4190\" data-end=\"4361\"\u003e\u003cstrong data-start=\"4190\" data-end=\"4244\"\u003eQ5: Can this downpipe work with the stock exhaust?\u003c\/strong\u003e\u003cbr data-start=\"4244\" data-end=\"4247\"\u003e\u003cstrong data-start=\"4247\" data-end=\"4253\"\u003eA:\u003c\/strong\u003e Yes, it is compatible with both OEM mid\/tail sections and aftermarket 4” or 5” \u003cstrong data-start=\"4333\" data-end=\"4352\"\u003eDuramax exhaust\u003c\/strong\u003e systems.\u003c\/p\u003e\n\u003cp data-start=\"4190\" data-end=\"4361\"\u003e\u003cstrong data-start=\"4368\" data-end=\"4421\"\u003eQ6: Does installation require cutting or welding?\u003c\/strong\u003e\u003cbr data-start=\"4421\" data-end=\"4424\"\u003e\u003cstrong data-start=\"4424\" data-end=\"4430\"\u003eA:\u003c\/strong\u003e No cutting or welding is needed. This is a bolt-on \u003cstrong data-start=\"4482\" data-end=\"4506\"\u003eL5P Duramax downpipe\u003c\/strong\u003e that uses factory-style mounting points and flange connections.\u003c\/p\u003e\n\u003cp data-start=\"4190\" data-end=\"4361\"\u003e\u003cstrong data-start=\"4577\" data-end=\"4628\"\u003eQ7: Will this downpipe change my exhaust sound?\u003c\/strong\u003e\u003cbr data-start=\"4628\" data-end=\"4631\"\u003e\u003cstrong data-start=\"4631\" data-end=\"4637\"\u003eA:\u003c\/strong\u003e Slightly. It deepens the tone and improves airflow. Paired with a full exhaust upgrade, the sound becomes much more aggressive.\u003c\/p\u003e\n\u003cp data-start=\"4190\" data-end=\"4361\"\u003e\u003cstrong data-start=\"4772\" data-end=\"4836\"\u003eQ8: What’s the wall thickness and corrosion resistance like?\u003c\/strong\u003e\u003cbr data-start=\"4836\" data-end=\"4839\"\u003e\u003cstrong data-start=\"4839\" data-end=\"4845\"\u003eA:\u003c\/strong\u003e Made from thick 2mm stainless steel with ceramic coating, it provides excellent heat and corrosion resistance in all weather conditions.\u003c\/p\u003e\n\u003cp data-start=\"4190\" data-end=\"4361\"\u003e\u003cstrong data-start=\"4989\" data-end=\"5043\"\u003eQ9: Can I use this as part of a DPF delete system?\u003c\/strong\u003e\u003cbr data-start=\"5043\" data-end=\"5046\"\u003e\u003cstrong data-start=\"5046\" data-end=\"5052\"\u003eA:\u003c\/strong\u003e Yes. It’s commonly used in \u003cstrong data-start=\"5080\" data-end=\"5111\"\u003eL5P Duramax downpipe delete\u003c\/strong\u003e setups as the first step in removing stock emissions restrictions. Off-road use only.\u003c\/p\u003e\n\u003cp data-start=\"5204\" data-end=\"5419\"\u003e\u003cstrong data-start=\"5204\" data-end=\"5263\"\u003eQ10: Who should buy this 3.5-inch downpipe from SPELAB?\u003c\/strong\u003e\u003cbr data-start=\"5263\" data-end=\"5266\"\u003e\u003cstrong data-start=\"5266\" data-end=\"5272\"\u003eA:\u003c\/strong\u003e It’s perfect for diesel enthusiasts looking to increase power, reduce turbo lag, and build a performance-tuned L5P truck for off-road or race use.\u003c\/p\u003e\n\u003cp\u003e---tab Shipping \u0026amp; Returns---\u003c\/p\u003e\n\u003cdiv class=\"policy-container\"\u003e\n\u003cdiv class=\"policy-item\"\u003e\n\u003ch3\u003eFast Shipping Policy\u003c\/h3\u003e\n\u003cp\u003eYour order will be dispatched within \u003cstrong\u003e1-2 business days\u003c\/strong\u003e, and the package will arrive within your order's estimated date. \u003ca href=\"https:\/\/www.spelabautoparts.com\/pages\/shipping-policy\"\u003eClick for Shipping Policy\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"policy-item\"\u003e\n\u003ch3\u003eEasy Return Policy\u003c\/h3\u003e\n\u003cp\u003eEvery order comes with a \u003cstrong\u003e14-day free return\u003c\/strong\u003e, which means you don't have to pay for a return slip. \u003ca href=\"https:\/\/www.spelabautoparts.com\/pages\/refund-policy\"\u003eClick for Return Policy\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"SPELAB","offers":[{"title":"Silver","offer_id":52624006480184,"sku":"SPES08074","price":228.0,"currency_code":"USD","in_stock":true},{"title":"Black","offer_id":52624006512952,"sku":"SPES08074BK","price":219.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1006\/3069\/2152\/files\/0005_88284a2a-2b3b-4133-8712-af1e9130a2c4.png?v=1783576288","url":"https:\/\/bsdptuning.com\/products\/3-5-downpipe-exhaust-for-2017-2024-l5p-6-6l-duramax-diesel-black-spelab","provider":"BSDP Tuning","version":"1.0","type":"link"}