Unlock exhaust flow and lower EGTs on your 2017–2025 6.6L L5P Duramax with PPE’s High-Flow Exhaust Manifolds and Up-Pipes Kit, engineered for 50‑state legal power, faster spool‑up, and long‑term reliability. This complete bolt‑on system replaces restrictive factory parts with cast hi‑sil moly manifolds and 11‑gauge 304 stainless up‑pipes designed to handle tuned and towing workloads
50‑state emissions legal, CARB E.O. D‑701‑34 for 2017–2021 L5P Duramax
Cast hi‑sil moly high‑flow exhaust manifolds for strength and improved flow
11‑gauge .120" wall 304 stainless steel up‑pipes with 2" OD for higher volume
Internally sleeved stainless bellows for durability under high heat and pressure
Built‑in 1/8" NPT EGT ports for easy pyro or data‑logging sensor installation
Designed to reduce drive pressure and EGTs and speed up turbo spool‑up
Complete kit includes manifolds, up‑pipes, gaskets, and hardware
Works with factory EGR and emissions equipment on 2017–2025 L5P trucks
PPE’s 2017–2025 GM 6.6L Duramax High‑Flow Exhaust Manifolds & Up‑Pipes Kit is engineered to replace restrictive factory hardware with a stronger, freer‑flowing system that improves turbo efficiency, lowers EGTs, and supports higher power while remaining emissions compliant on applicable applications.
2017–2025 Chevy Silverado 2500HD/3500HD 6.6L L5P Duramax with EGR intact.
2017–2025 GMC Sierra 2500HD/3500HD 6.6L L5P Duramax with EGR intact.
Designed as a direct bolt‑on replacement for OEM manifolds and up‑pipes while retaining factory emissions equipment on compatible vehicles.
50‑state emissions legal when used with all emissions components in place under CARB E.O. D‑701‑34 / D‑701‑35, depending on exact part number.
High‑sil moly cast iron manifolds for high‑strength, crack‑resistant construction and improved internal flow.
304 stainless steel up‑pipes, 11‑gauge .120" wall with 2" outside diameter for increased exhaust volume versus stock.
Internally sleeved stainless bellows to withstand extreme temperature and pressure cycles and prevent cracking and leaks.
Built‑in 1/8" NPT bosses pre‑drilled and tapped for EGT gauge or additional sensors, simplifying monitoring.
Complete gasket and hardware set including high‑temp manifold gaskets, upper and lower up‑pipe gaskets, and manifold bolts/studs/spacers (per PPE kit contents).
Up‑pipes designed to be compatible with factory heat shields for OE‑like serviceability and thermal protection.
Optional ceramic‑coated manifolds create a thermal barrier to lower surface temperatures, reduce EGTs further, and improve corrosion resistance and appearance.
The freer‑flowing manifolds and 2" up‑pipes significantly reduce exhaust back‑pressure versus the thin, restrictive OEM components, especially under heavy load or tuning. Lower back‑pressure improves turbo spool‑up, lowers EGTs, and enhances fuel economy and reliability, particularly for towing, performance use, or tuned trucks that demand consistent exhaust flow. The robust hi‑sil moly casting and heavy‑wall stainless construction address common factory issues like warping, cracking, and bellows leaks, providing a long‑term solution rather than a simple replacement.
PPE lists a 3‑year limited warranty on this manifold and up‑pipe kit, covering defects in materials and workmanship for the original purchaser, subject to PPE’s terms and conditions.
Warranty does not cover improper installation, misuse, racing damage, or alteration of the product; all claims must follow PPE’s current warranty procedures.
Product remains emissions legal only when installed on approved applications with all emissions equipment functioning, as specified by the corresponding CARB E.O.
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