2011-2015 GMC/CHEVROLET 6.6L DURAMAX LML UPGRADED 3" HIGH FLOW 3” TURBO DOWNPIPE
Unlock the full potential of your 2011–2015 GMC/Chevrolet 6.6L Duramax LML with this Upgraded 3" High-Flow Turbo Downpipe. This precision-engineered pipe replaces the restrictive factory downpipe with a full 3” mandrel-bent system, allowing for increased exhaust flow, reduced EGTs, and faster turbo spool.
The OEM downpipe on LML trucks is severely necked down, limiting airflow and increasing backpressure. Our upgraded downpipe features a smooth, mandrel-bent 3” diameter, designed to reduce turbulence and improve turbo efficiency. Constructed from aluminized or stainless steel (depending on availability), this bolt-on downpipe fits seamlessly into the factory location and pairs with the OEM or aftermarket exhaust systems.
What’s Included in the Kit:
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1 - 3" Stainless Steel Downpipe
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2 - Stainless Steel Hose Clamps
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1 - Roll of Titanium Heat Wrap
Features & Benefits:
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Fits 2011–2015 6.6L Duramax LML Silverado and Sierra 2500HD/3500HD
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3" mandrel-bent design increases exhaust velocity and flow
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Reduces exhaust backpressure and lowers EGTs
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Improves turbo spool, throttle response, and performance
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Smooth, unrestricted interior improves exhaust scavenging
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Direct bolt-on design with factory-style flanges
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Compatible with stock and aftermarket exhaust systems
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Designed for off-road, race, or performance applications
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Ideal for tuned trucks or towing under heavy load
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Durable aluminized or stainless steel construction
Truck Compatibility / Applications:
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2011–2015 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML
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2011–2015 GMC Sierra 2500HD / 3500HD 6.6L Duramax LML
The 3" High-Flow Turbo Downpipe for 2011–2015 LML Duramax trucks is a critical upgrade for reducing EGTs, improving turbo response, and maximizing airflow. Built to handle performance demands, this downpipe is a must-have for any LML owner pushing their truck beyond stock limits.
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✔️ Expedited shipping options are available at checkout.
✔️ Orders are processed within 1 business day (Monday–Friday).
✔️ Orders placed on weekends or holidays will be processed on the next business day.
✔️ Tracking information will be provided once the item ships.
✔️ Shipping to PO Boxes, APO/FPO may be limited based on carrier restrictions.
California Proposition 65 Warning:
This product may expose you to chemicals including metallic nickel, chromium, and exhaust fumes, known to the State of California to cause cancer, birth defects, or other reproductive harm.
For more information, visit: www.P65Warnings.ca.gov
