Product Details
Fitment
FAQ
Shipping & Returns
3-Inch Turbo Downpipe for the 6.6L LML Duramax
Replace the restrictive factory turbo downpipe on your 2011–2015 Chevrolet Silverado or GMC Sierra HD with this Flashark 3-inch stainless-steel downpipe.
Located directly after the turbocharger, the factory downpipe contains a narrow, crushed section that can restrict exhaust flow. The larger 3-inch Flashark downpipe provides a smoother exhaust path while retaining the compatible downstream exhaust and emissions equipment.
The mandrel-bent stainless-steel construction, TIG-welded joints and included thermal wrap are designed to withstand the heat and vibration generated by the LML Duramax turbo-diesel engine.
Important: This is a turbo downpipe, not a DPF delete pipe. Installing this downpipe alone does not remove the truck’s DPF, DOC, DEF or SCR system.
Key Features
- Full 3-Inch Pipe: Provides a larger and smoother exhaust path than the restrictive factory turbo downpipe.
- V-Band Connection: Designed for 2011–2015 LML applications equipped with the compatible V-band exhaust connection.
- T-304 Stainless-Steel Construction: Offers resistance to exhaust heat and corrosion.
- Mandrel-Bent Tubing: Helps maintain the pipe’s internal diameter through the bends.
- TIG-Welded Joints: Reinforced connections provide strength and reliable exhaust sealing.
- Titanium Heat Wrap Included: Helps manage radiant heat around the rear of the engine and firewall area.
- Compatible with the Factory-Style Turbo: Designed around the original-style LML turbo outlet and V-band connection.
What to Expect
- Reduced restriction immediately after the turbocharger
- Smoother exhaust flow through the turbo downpipe
- Potentially quicker turbo response
- A slightly more noticeable turbo and exhaust sound
- Improved support for compatible intake, exhaust and tuning upgrades
Performance Notice: Actual results depend on the vehicle’s condition, turbocharger, downstream exhaust, ECU calibration and other modifications. A specific horsepower, torque or fuel-economy increase is not guaranteed.
Specifications
| Product Type | Turbo Downpipe |
| Engine Application | 6.6L LML Duramax Turbo Diesel |
| Pipe Diameter | 3 Inches |
| Material | T-304 Stainless Steel |
| Connection Type | V-Band |
| Construction | Mandrel-Bent and TIG-Welded |
| DPF Delete | No |
| Installation | Professional Installation Recommended |
Package Includes
- Downpipe
- Gasket(s)
- O2 sensor bung
- Mounting hardware
Important Installation Notes
- Confirm that the truck has the 6.6L LML Duramax engine.
- Confirm that the downpipe connection uses a V-band clamp before ordering.
- Some late-2015 trucks use the newer 3-bolt connection and are not compatible.
- Allow the engine and exhaust system to cool completely before installation.
- Professional installation is recommended because access behind the turbocharger is limited.
- Inspect and test-fit the product before wrapping, modifying or fully installing it.
Shipping, Returns & Warranty
- Shipping: Orders are normally dispatched within 1–2 business days. Delivery time depends on the destination and available warehouse.
- Returns: Covered by Flashark’s 30-day return policy when the product is new, uninstalled and in its original condition.
- Warranty: Includes a 12-month limited warranty against qualifying manufacturing defects.
Compliance Notice: This product is a replacement turbo downpipe and does not remove the factory DPF, DOC, DEF or SCR system. However, emissions and aftermarket-part regulations vary by location. Verify applicable requirements before purchasing or installing the product.
Fitment
Fits the following Chevrolet Silverado HD and GMC Sierra HD pickup trucks equipped with the 6.6L LML Duramax turbo-diesel engine and V-band downpipe connection.
| Year | Make | Model | Trim | Engine |
|---|---|---|---|---|
| 2011–2014 | Chevrolet | Silverado 2500 HD | WT, LT, LTZ | 6.6L LML Duramax Turbo Diesel |
| 2015 | Chevrolet | Silverado 2500 HD | WT, LT, LTZ, High Country | 6.6L LML Duramax Turbo Diesel |
| 2011–2014 | Chevrolet | Silverado 3500 HD | WT, LT, LTZ | 6.6L LML Duramax Turbo Diesel |
| 2015 | Chevrolet | Silverado 3500 HD | WT, LT, LTZ, High Country | 6.6L LML Duramax Turbo Diesel |
| 2011–2014 | GMC | Sierra 2500 HD | WT, SLE, SLT, Denali | 6.6L LML Duramax Turbo Diesel |
| 2015 | GMC | Sierra 2500 HD | Base, SLE, SLT, Denali | 6.6L LML Duramax Turbo Diesel |
| 2011–2014 | GMC | Sierra 3500 HD | WT, SLE, SLT, Denali | 6.6L LML Duramax Turbo Diesel |
| 2015 | GMC | Sierra 3500 HD | Base, SLE, SLT, Denali | 6.6L LML Duramax Turbo Diesel |
Important 2015 Fitment Check
Some late-production 2015 trucks use the newer 3-bolt downpipe connection. This product uses a V-band connection and does not directly fit trucks equipped with the 3-bolt flange.
- Round clamp around the joint: V-band — compatible.
- Triangular flange with three bolts: Not compatible.
Not Confirmed / Does Not Fit
- 2015.5–2016 trucks equipped with the 3-bolt downpipe connection
- Chevrolet Express or GMC Savana vans
- Cab-and-chassis applications not included in the confirmed fitment data
- LB7, LLY, LBZ, LMM or L5P Duramax engines
- Trucks with a non-factory-style turbo outlet unless separately confirmed
Q: What vehicles does this LML downpipe fit?
It fits confirmed 2011–2015 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD pickup applications equipped with the 6.6L LML Duramax engine and V-band downpipe connection. Check the full Fitment table for the applicable trims.
Q: Does it fit every 2015 LML Duramax?
No. Some late-production 2015 trucks use a 3-bolt downpipe connection. This product uses a V-band connection. Check the connection before ordering: a round clamp indicates a V-band connection, while a triangular flange with three bolts is not compatible.
Q: Does this downpipe fit a 2016 LML Duramax?
No direct 2016 fitment is confirmed for this V-band version. Most 2015.5–2016 trucks use the later 3-bolt connection and require a different downpipe.
Q: Is this a DPF delete pipe?
No. This product replaces the turbo downpipe located immediately after the turbocharger. It does not replace or remove the factory DPF, DOC, DEF or SCR system.
Q: Will the factory DPF and DEF system remain installed?
Yes. A downpipe-only installation retains the compatible downstream DPF, DOC, DEF and SCR components. This product should not be described as a full emissions-delete system.
Q: Is a DPF delete tune required?
No DPF-delete tune is required for a downpipe-only installation that retains the factory emissions system. If the truck has other exhaust, turbo or engine modifications, consult a qualified Duramax technician regarding the appropriate calibration.
Q: What performance changes should I expect?
The larger 3-inch pipe is designed to reduce restriction immediately after the turbocharger and support smoother exhaust flow. Actual changes in turbo response, exhaust temperature, horsepower and torque depend on the vehicle’s condition and supporting modifications. A fixed performance increase is not guaranteed.
Q: Will the downpipe make my truck louder?
The downpipe may make the turbo and exhaust tone slightly more noticeable, but the change is normally less dramatic than replacing the complete exhaust system. Sound depends on the remaining DPF, muffler and downstream exhaust configuration.
Q: Does it work with the factory turbocharger?
It is designed for the original-style LML turbo outlet and compatible V-band connection. Fitment with an aftermarket turbocharger depends on the turbo outlet design and should be confirmed before ordering.
Q: What is included in the package?
The package includes:
- One 3-inch stainless-steel turbo downpipe
- Two stainless-steel clamps
- One roll of titanium heat wrap
Compare the received components with the package image before installation.
Q: Is professional installation recommended?
Yes. The downpipe is installed in a confined area behind the turbocharger. Professional installation helps ensure correct alignment, clamp sealing, heat-wrap placement and adequate clearance from nearby hoses, wiring and heat-sensitive components.
Q: Can I return it if the connection does not match?
Check the V-band connection and test-fit the product before wrapping, modifying or operating the vehicle. Installed, modified, scratched or exhaust-exposed parts may not qualify for return under Flashark’s return policy.
Fast Shipping Policy
Your order will be dispatched within 1-2 business days, and the package will arrive within your order's estimated date. Click for Shipping Policy
Easy Return Policy
Every order comes with a 30-day free return, provided the item is brand new, uninstalled, and in its original packaging. We cover return shipping for quality issues. Refunds are processed within 3-5 business days. Click for Return Policy
Worry-Free Delivery Protection
Add Worry-Free Delivery at checkout — if it's lost, stolen, or damaged, you're 100% covered. Click for Worry-Free Delivery Protection