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Competition Series 3" Turbo Downpipe Upgrade | 2015.5-2016 LML Duramax

Upgrade your truck’s exhaust system with our premium 3" Downpipe designed specifically for 2015.5-2016 LML 6.6L Duramax engines. Engineered for performance and durability, this downpipe is crafted from high-quality 304 stainless steel to ensure long-lasting resistance against corrosion and extreme heat. By improving exhaust flow, this upgrade helps reduce backpressure, allowing your engine to breathe more efficiently and perform at its best.

Key Features

• Precision Engineering: Custom-designed to fit 2015.5-2016 LML 6.6L Duramax diesel engines perfectly for a seamless installation.
• Premium Material: Constructed from heavy-duty 304 stainless steel, offering superior durability and rust resistance compared to stock components.
• Enhanced Performance: The 3-inch diameter design optimizes exhaust gas flow, effectively reducing backpressure for better throttle response and overall engine efficiency.
• Reliable Build: Engineered to withstand the rigors of high-performance diesel applications.
• Perfect Fit: Built to OEM specifications to ensure no clearance issues during the installation process.

Specification

• Material: 304 Stainless Steel
• Pipe Diameter: 3 Inches
• Compatibility: 2015.5-2016 LML 6.6L Duramax Diesel Engines

New Version Upgrades: Superior Performance & Durability

We have completely overhauled our design to provide maximum reliability and engine bay aesthetics. The new version features significant improvements over the old version:

Material Upgrade (Full 304 Stainless Steel)

Old Version: Used 201 stainless steel pipes with standard iron flanges, susceptible to rust, thermal deformation, and exhaust leaks over time.
New Version: Fully upgraded to Premium 304 Stainless Steel for both the pipe and the flange. This ensures exceptional corrosion resistance, superior thermal stability, and an airtight seal even under extreme high-temperature conditions.

Heat Wrap Upgrade (High-Performance Black Fiber)

Old Version: Standard natural fiberglass wrap that is prone to fading, fraying, and dusting after heat cycles.
New Version: Upgraded to Professional-Grade Black Fiberglass Heat Wrap. This provides superior heat insulation to lower engine bay temperatures, resists aging, and prevents peeling, offering a cleaner, more aggressive racing-style appearance.

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Vehicle Fitment

• Years: 2015.5-2016
• Make: Duramax
• Models: Silverado 2500HD / 3500HD, Sierra 2500HD / 3500HD
• Engine: 6.6L Duramax LML
• Body: Pickup only