2004.5-2010 GMC/CHEVROLET 6.6L DURAMAX LLY/LBZ/LMM HIGH FLOW 3" TURBO DOWNPIPE
Upgrade the turbo exhaust flow on your 2004.5–2010 GMC or Chevrolet 6.6L Duramax LLY, LBZ, or LMM engine with this 3" high-flow turbo downpipe. Designed to replace the restrictive factory downpipe, this mandrel-bent 3-inch unit improves turbo efficiency by reducing backpressure, lowering EGTs (exhaust gas temperatures), and enhancing overall exhaust flow.
Crafted from heavy-duty stainless steel, is a direct-fit upgrade that bolts up to the factory turbo and mates to the stock or aftermarket exhaust system. Whether you're towing, running performance tunes, or simply want to reduce turbo lag and heat soak, this downpipe delivers noticeable gains in spool-up and engine response.
What’s Included in the Kit:
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3 Inch Turbo Down Pipe
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Titanium Exhaust Wrap
Key Benefits:
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Improves Exhaust Flow: Larger diameter and smooth mandrel bends reduce backpressure, helping your turbo spool faster and improving throttle response.
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Boosts Power & Torque: Reduces restrictions in the exhaust path, supporting noticeable gains in horsepower—great for towing or performance use.
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Increases Fuel Efficiency: Better exhaust scavenging helps your engine breathe easier, often resulting in improved MPG.
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Built for Durability: Made from high-quality stainless or aluminized steel to resist heat, corrosion, and wear.
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Direct-Fit Installation: Bolts to the factory turbo and connects to stock or aftermarket exhaust with no major modifications.
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Aggressive Turbo Sound: Enhances turbo whistle and exhaust tone without being overly loud.
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Emissions System Friendly: Designed to retain compatibility with the factory emissions system—verify local laws before installation.
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Upgrade-Ready: Pairs perfectly with other performance parts like tuners, cold air intakes, and full exhaust systems.
Vehicle Compatibility:
Make: Chevrolet / GMC
Engine: 6.6L Duramax Diesel
Years and Models:
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2004.5–2005 Chevrolet Silverado 2500HD / 3500 (LLY)
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2006–2007 Chevrolet Silverado 2500HD / 3500 (LBZ)
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2007.5–2010 Chevrolet Silverado 2500HD / 3500 (LMM)
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2004.5–2005 GMC Sierra 2500HD / 3500 (LLY)
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2006–2007 GMC Sierra 2500HD / 3500 (LBZ)
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2007.5–2010 GMC Sierra 2500HD / 3500 (LMM)
Replacing your restrictive factory turbo downpipe is one of the most effective ways to boost exhaust flow and performance in your Duramax engine. Whether used for towing, daily driving, or power-focused builds, this high-flow 3-inch downpipe delivers smoother exhaust flow and reduced turbo strain without compromising reliability.
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✔️ Orders placed on weekends or holidays will be processed on the next business day.
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California Proposition 65 Warning:
This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
