Collection: GM Duramax Exhaust Systems

DIESELR’s GM Duramax performance exhaust systems are built to eliminate factory restrictions, improve turbo spool-up, and reduce EGTs for 2.8L, 3.0L, and 6.6L Duramax engines. Whether you need a turbo-back or downpipe-back exhaust, our systems are engineered for real-world durability and power gains.

✔ Mandrel-bent stainless steel for maximum flow & durability
✔ Direct-fit installation with turbo-back & downpipe-back options
✔ Designed for LB7, LLY, LBZ, LMM, LML, L5P, LM2, and LWN Duramax models

Turbo-Back & Downpipe-Back Exhaust Kits

Upgrade to a high-flow exhaust system that improves turbo efficiency and unlocks real power.

• Lower EGTs for increased reliability under heavy loads
• Deep, aggressive tone that lets your Duramax sound like it should
• Designed for 2001-2024 Duramax 6.6L & 2.8L/3.0L diesel models

Duramax Exhaust Manifolds & Downpipes

Optimize exhaust flow at the source with high-flow manifolds and downpipes for stronger turbo response.

• Reduces backpressure for improved turbo efficiency
• Mandrel-bent construction for unrestricted airflow
• Built for 2001-2024 Duramax applications

Performance Mufflers & Delete Pipes

Fine-tune your exhaust note with performance mufflers and delete pipes built specifically for Duramax diesel applications.

• Straight-through designs for maximum exhaust velocity
• Options for deep, aggressive tone or reduced cabin noise
• Fits 6.6L L5P, LML, LMM, and other Duramax applications