{"product_id":"2017-2023-6-6l-l5p-duramax-diesel-3-5-downpipe-exhaust","title":"2017-2023 6.6L Chevy L5P Duramax Diesel 3.5\" Downpipe Exhaust","description":"\u003c!-- more --\u003e\n\u003ch4\u003eFITMENT\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e2017-2023 6.6L Silverado \u0026amp; Sierra Duramax L5P 2500HD 3500HD Diesel engine trucks.\u003c\/li\u003e\n\u003cli\u003eNote: Will NOT fit Cab \u0026amp; Chassis commercial-style trucks.\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\"\u003eThe factory downpipe on 17-23 Duramax L5P trucks is a major performance choke point. To bypass tight firewall clearance, the stock pipe was severely stamped and flattened into an oval shape.\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eThis restrictive design traps intense heat right at the turbo outlet, choking exhaust flow, slowing spool-up, and raising EGTs.\u003c\/li\u003e\n\u003cli class=\"MsoNormal\"\u003eUpgrading to our massive, 3.5\" 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\u003eMassive 3.5\" Flow: Replaces the restrictive, \"pancake\" factory pipe with a true, consistent 3.5“ mandrel-bent round diameter through every turn.\u003c\/li\u003e\n\u003cli\u003eMassive EGT Drop: Expels scorching exhaust gases rapidly away from the turbo, significantly lowering under-hood heat and promoting engine longevity.\u003c\/li\u003e\n\u003cli\u003eBung-less Design: No unnecessary sensor ports to plug, perfectly matching the original L5P factory configuration for a true plug-and-play install.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFAQ\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the main benefits of upgrading to a 3.5\" downpipe?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The original factory pipe is crushed flat to clear the firewall. Replacing it with our true 3.5\" round mandrel-bent pipe lowers exhaust backpressure, significantly drops EGTs under heavy towing loads, and delivers much quicker turbo spool-up.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this downpipe require custom tuning?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No. If installed on an otherwise stock truck, no custom tuning is required and it will not throw a Check Engine Light (CEL) or trigger limp mode because it does not alter any emissions sensors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: I want to add an aftermarket EGT gauge — does this pipe have a bung?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No. The pipe has no pre-welded sensor bungs. The L5P factory EGT sensors are on the exhaust manifold and inside the close-coupled DPF unit. If you want a probe for an aftermarket gauge, have a shop weld a 1\/8\" NPT bung on the downpipe or delete pipe.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Besides this downpipe, what other modifications can maximize my L5P's performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: This 3.5\" downpipe fixes the turbo bottleneck, but it’s just step one. To fully unlock truck’s raw power and fuel economy, upgrade to \u003cspan style=\"text-decoration: underline;\"\u003e\u003cspan style=\"color: rgb(43, 0, 255); text-decoration: underline;\"\u003e\u003ca rel=\"noopener\" title=\"L5P Bundle all-in-one kit\" href=\"https:\/\/www..com\/products\/-2017-2023-6-6l-duramax-l5p-dpf-ccv-egr-delete-downpipe-w-can-bus-kit\" style=\"color: rgb(43, 0, 255); text-decoration: underline;\" target=\"_blank\"\u003eL5P Bundle all-in-one kit\u003c\/a\u003e\u003c\/span\u003e\u003c\/span\u003e. This premium mega-pack bundles this exact modules to eliminate engine-choking soot in one shot!\u003c\/p\u003e","brand":"True American Diesel","offers":[{"title":"Default Title","offer_id":47261113450684,"sku":"DP-0170","price":458.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/4101\/8044\/files\/1_7753fa05-1a5f-4624-948b-6106721306ca.jpg?v=1786464545","url":"https:\/\/trueamericandiesel.com\/products\/2017-2023-6-6l-l5p-duramax-diesel-3-5-downpipe-exhaust","provider":"TrueAmericanDiesel","version":"1.0","type":"link"}