Dieselr High Flow Exhaust Manifold w/o EGR Provision - Pair | 2017–2026 Duramax L5P

The Dieselr High Flow Exhaust Manifold L5P w/o EGR Provision - Pair is built for the 2017–2024 Duramax 6.6L that’s ready for serious work and performance. It replaces the weak, restrictive factory castings that crack, warp, and leak under heat and load.

Each manifold is precision-cast from thick-wall, heat-resistant iron and machined for a perfect seal. The result is a stronger, cleaner path for exhaust flow — no thin flanges, no warping, no EGR restriction.

Performance-Driven Design for Duramax L5P

• No EGR provision for a simplified, streamlined exhaust path

• Thicker flange and runner walls to prevent cracking and burnout

• Optimized flow for better turbo spool and lower EGTs

• Rust-resistant finish for long-term durability

• Direct bolt-on fitment for 2017–2024 6.6L Duramax trucks

This high flow manifold design improves exhaust scavenging and reduces backpressure, helping your turbo respond faster and run cooler under load. Whether you’re towing or tuning, you’ll see improved throttle response and longer component life.

Built to Last

Each kit includes new gaskets and mounting hardware for a leak-free install. Precision flanges maintain tight seal under boost, and heavy-duty casting resists heat cycle fatigue that kills stock parts.

When your Duramax works hard, cheap manifolds don’t cut it. The Dieselr High Flow Exhaust Manifold L5P delivers stronger flow, better fit, and the durability serious diesel owners demand — because every psi of boost starts with solid hardware.

Pair It with Dieselr Up-Pipes for Maximum Flow

For the ultimate upgrade, pair this manifold kit with the Dieselr Up-Pipes for 2017–2024 GM 2500/3500 6.6L Duramax L5P.
These high-flow up-pipes are engineered to complement the manifold’s improved exhaust path, delivering even better turbo response and temperature control under load. Together, they create a complete, high-efficiency exhaust flow system that’s built to handle serious tuning, towing, and long-term reliability.