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PPE 116121115 High Flow OEM Length Up-Pipes 2011–2016 GM 6.6L Duramax LML | Direct Bolt-On Replacement
Factory up-pipes on the LML Duramax are a common failure point. Constant heat cycling and exhaust pressure cause the OEM pipes to crack, leak, and restrict flow over time. PPE has engineered a superior direct replacement that delivers up to 53% greater exhaust flow while maintaining perfect OEM-length fitment and full emissions compliance.
Built from 11-gauge 304 stainless steel (.120" wall thickness) with a 2" outer diameter, these up-pipes feature internally sleeved 304 stainless steel bellows designed to handle extreme heat and pressure far better than factory components.
Key Features & Benefits
- Up to 53% more exhaust flow than stock — significantly reduces backpressure
- Faster turbo spool-up and improved throttle response
- Lower EGTs (exhaust gas temperatures)
- Direct bolt-on fitment to factory exhaust manifolds using stock hardware
- Maintains full compatibility with EGR and emissions equipment
- Includes driver and passenger side pipes + stainless steel up-pipe gaskets
- 50-state emissions legal — CARB Executive Order D-701-33
Fitment
2011–2016 Chevrolet Silverado 2500HD / 3500HD 2011–2016 GMC Sierra 2500HD / 3500HD 6.6L Duramax LML engine
These are the correct OEM-length high-flow replacement up-pipes for trucks equipped with factory exhaust manifolds.
Built for Durability & Performance
Whether you're replacing failed stock up-pipes or building a stronger foundation for future modifications, PPE’s stainless steel construction and sleeved bellows design provide the reliability and flow your LML Duramax deserves.
PPE 116121115 High Flow OEM Length Up-Pipes 2011–2016 GM 6.6L Duramax LML | Direct Bolt-On Replacement
Factory up-pipes on the LML Duramax are a common failure point. Constant heat cycling and exhaust pressure cause the OEM pipes to crack, leak, and restrict flow over time. PPE has engineered a superior direct replacement that delivers up to 53% greater exhaust flow while maintaining perfect OEM-length fitment and full emissions compliance.
Built from 11-gauge 304 stainless steel (.120" wall thickness) with a 2" outer diameter, these up-pipes feature internally sleeved 304 stainless steel bellows designed to handle extreme heat and pressure far better than factory components.
Key Features & Benefits
Up to 53% more exhaust flow than stock — significantly reduces backpressure
Faster turbo spool-up and improved throttle response
Lower EGTs (exhaust gas temperatures)
Direct bolt-on fitment to factory exhaust manifolds using stock hardware
Maintains full compatibility with EGR and emissions equipment
Includes driver and passenger side pipes + stainless steel up-pipe gaskets
50-state emissions legal — CARB Executi[...]
PPE 116121115 High Flow OEM Length Up-Pipes 2011–2016 GM 6.6L Duramax LML | Direct Bolt-On Replacement
Factory up-pipes on the LML Duramax are a common failure point. Constant heat cycling and exhaust pressure cause the OEM pipes to crack, leak, and restrict flow over time. PPE has engineered a superior direct replacement that delivers up to 53% greater exhaust flow while maintaining perfect OEM-length fitment and full emissions compliance.
Built from 11-gauge 304 stainless steel (.120" wall thickness) with a 2" outer diameter, these up-pipes feature internally sleeved 304 stainless steel bellows designed to handle extreme heat and pressure far better than factory components.
Key Features & Benefits
- Up to 53% more exhaust flow than stock — significantly reduces backpressure
- Faster turbo spool-up and improved throttle response
- Lower EGTs (exhaust gas temperatures)
- Direct bolt-on fitment to factory exhaust manifolds using stock hardware
- Maintains full compatibility with EGR and emissions equipment
- Includes driver and passenger side pipes + stainless steel up-pipe gaskets
- 50-state emissions legal — CARB Executive Order D-701-33
Fitment
2011–2016 Chevrolet Silverado 2500HD / 3500HD 2011–2016 GMC Sierra 2500HD / 3500HD 6.6L Duramax LML engine
These are the correct OEM-length high-flow replacement up-pipes for trucks equipped with factory exhaust manifolds.
Built for Durability & Performance
Whether you're replacing failed stock up-pipes or building a stronger foundation for future modifications, PPE’s stainless steel construction and sleeved bellows design provide the reliability and flow your LML Duramax deserves.