{"product_id":"black-4-0-downpipe-back-exhaust-for-2020-2025-l5p-6-6-duramax-dpf-delete-kit-spelab","title":"Black 4.0\" Downpipe-Back Exhaust for 2020-2025 L5P 6.6 Duramax DPF Delete Kit | SPELAB","description":"\u003cp\u003e---tab Description---\u003c\/p\u003e\n\u003ch2\u003eBlack L5P 4\" Exhaust Overview\u003c\/h2\u003e\n\u003cp\u003eFit for 2020-2025 L5P 6.6 Duramax, our 4-inch black downpipe-back DPF delete exhaust replaces your restrictive stock system to boost engine horsepower, torque and throttle response, paired with a deep, aggressive exhaust sound. Built with durable 409 stainless steel, black powder coating and titanium heat wrap, it offers excellent heat and corrosion resistance. A great upgrade for towed, off-road and tuned trucks, it improves overall performance, fuel efficiency and undercarriage styling.\u003c\/p\u003e\n\u003ch2\u003eBlack 4\" Downpipe-Back Exhaust Key Features\u003c\/h2\u003e\n\u003cp\u003eBy replacing the factory restrictive exhaust setup, SPELAB L5P 4.0\" Downpipe-Back optimizes overall engine operational efficiency, boosts gas mileage, cuts down long-term fuel costs, and ensures stable, superior performance during heavy-load towing and off-road adventures.\u003c\/p\u003e\n\u003ch3\u003eBlack Powder Coating for Heat and Corrosion Protection\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Temperature Protection\u003c\/strong\u003e: Professional-grade coating withstands brutal exhaust heat, preventing discoloration and heat damage for long-lasting performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Corrosion Resistance\u003c\/strong\u003e: Shields against road salt, moisture, mud, and off-road debris, ensuring lifelong durability even in harsh environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved Aesthetics:\u003c\/strong\u003e Sleek matte black finish transforms your truck’s undercarriage, giving it a stealthy, performance-focused look that matches your Duramax’s power..\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBlack Titanium Heat Wrap for Head Pipe Heat Control\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0174\/0609\/9556\/files\/listing03.webp?v=1782094639\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Underbody Heat Radiation:\u003c\/strong\u003e Blocks harmful heat from damaging sensitive hoses, wiring, fuel lines, and engine components, extending part life and preventing heat-related failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme Temperature Endurance:\u003c\/strong\u003e Rated to withstand over 1000°C (1832°F) – ideal for tuned Duramax engines, heavy towing, and high-performance off-road use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Exhaust Flow:\u003c\/strong\u003e Eliminates heat soak, keeps exhaust gases moving fast, and optimizes engine efficiency for consistent power gains and smoother operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e⚠ Off-Road Use Only – DPF removal is illegal for on-road vehicles in most regions. For competition\/racing use only.\u003c\/p\u003e\n\u003ch2\u003eDownpipe-Back Exhaust Specification\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial: \u003c\/strong\u003ePremium 409 Stainless Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish: \u003c\/strong\u003eHigh-Temperature Black Powder Coating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat Management: \u003c\/strong\u003eBlack Titanium Heat Wrap on Head Pipe\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type: \u003c\/strong\u003eDownpipe-Back DPF Delete\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication: \u003c\/strong\u003eDesigned for Downpipe-back systems, ideal for high-temperature environments, towing, heavy loads, performance-tuned vehicles, and off-road use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability: \u003c\/strong\u003eBuilt to enhance exhaust system robustness and impact resistance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003cp\u003eInstall takes about 1hr with basic hand tools done on the ground of your driveway or garage. Quicker if you have automotive style lift. Cutting may be be required to fit shorter wheelbase bed\/cab configurations. Clamps, hangers and hardware are included. You may have to re-use some factory hardware.\u003c\/p\u003e\n\u003ch3\u003eTuner Required for DPF Delete Exhaust Installation\u003c\/h3\u003e\n\u003cp\u003eRemoval of the DPF, CAT, SCR, and\/or DOC involves removing and eliminating emission related sensors. A DPF delete capable tuner is required to prevent any check engine light or diagnostic trouble codes from setting.\u003c\/p\u003e\n\u003cp\u003e---tab Fitment---\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eL5P Duramax Downpipe-Back Exhaust Fitment\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e2020-2025 L5P 6.6L Duramax Diesel GMC Sierra 2500 HD\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e2020-2025 L5P 6.6L Duramax Diesel GMC Sierra 3500 HD\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e2020-2025 L5P 6.6L Duramax Diesel Chevrolet Silverado 2500 HD\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e2020-2025 L5P 6.6L Duramax Diesel Chevrolet Silverado 3500 HD\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eCrew cab short bed \u0026amp; crew cab long bed. This will \u003cspan style=\"color: rgb(255, 42, 0);\"\u003eNOT FIT the 3500\/4500\/5500 Cab \u0026amp; Chassis commercial style truck\u003c\/span\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eIf you need 4.0\" Downpipe-Back, you can click \u003ca href=\"https:\/\/www.spelabautoparts.com\/products\/downpipe-back-2017-2022-l5p-6-6-duramax-dpf-delete-race-pipe?variant=46020816044283\"\u003e\u003cstrong\u003eHERE\u003c\/strong\u003e\u003c\/a\u003e to purchase.\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":"Without Exhaust Tip","offer_id":48998247235835,"sku":"SPJN-EXS22-00001009","price":589.0,"currency_code":"USD","in_stock":true},{"title":"With Exhaust Tip","offer_id":48998247268603,"sku":"SPJN-EXS22-00001009-ES08019SP","price":619.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/0609\/9556\/files\/01_560bf389-2348-4e93-9b9d-d4e1968d9fb1.webp?v=1782094640","url":"https:\/\/www.spelabautoparts.com\/products\/black-4-0-downpipe-back-exhaust-for-2020-2025-l5p-6-6-duramax-dpf-delete-kit-spelab","provider":"SPELAB","version":"1.0","type":"link"}