2017–2026 Duramax L5P High Flow Exhaust Manifold Pair

L5P Dieselr High Flow Exhaust Manifold Set 

Fits 2017–2024 GM 6.6L Duramax L5P

The Dieselr High Flow Exhaust Manifold Set for the 2017–2024 Duramax L5P is built for trucks that see real heat, real load, and real abuse. It replaces the restrictive factory manifolds that are known to crack, warp, and leak over time—especially on tuned or hard-working trucks.

Each manifold is precision-cast from thick-wall, heat-resistant iron and machined for a proper sealing surface. The result is a stronger, smoother exhaust path with improved flow and long-term reliability.

Performance Driven Design

• Simplified, streamlined exhaust path

• Thick flange + runner walls to prevent cracking and burnout

• Optimized flow for faster turbo spool and lower EGTs

• Rust-resistant finish for long-term durability

• Direct bolt-on fitment for 2017–2024 Duramax L5P trucks

This high-flow design reduces backpressure and improves exhaust scavenging, helping your turbo respond quicker and run cooler under load. Perfect for towing, work trucks, and performance builds.

Built to Last

This kit includes new gaskets and mounting hardware for a leak-free install. Precision flanges maintain a strong seal under boost, while the heavy-duty casting resists the heat cycle fatigue that kills factory manifolds.

When your Duramax works hard, weak manifolds don’t cut it. This set is built for owners who want better flow, better fit, and real durability.

Recommended Upgrade: Pair with Dieselr Up-Pipes

For maximum results, pair these manifolds with Dieselr Up-Pipes (2017–2024 L5P). The upgraded flow path works together to improve turbo response and control temps, creating a complete high-efficiency setup built for serious towing, tuning, and long-term reliability.