Description
Large Bore-HD 4" Cat-Back Exhaust System
409 Stainless Steel | High-Flow Performance Exhaust
For 2006–2007 GM 6.6L Duramax HD Trucks
Built to withstand extreme conditions while delivering maximum performance, the aFe POWER Large Bore-HD 4" Cat-Back Exhaust System is engineered for serious diesel enthusiasts who demand increased power, durability, and sound control. Featuring mandrel-bent 4-inch 409 stainless steel tubing, this exhaust system significantly improves exhaust flow, resulting in increased horsepower, increased torque, and reduced exhaust gas temperatures (EGTs).
Designed as a complete 4" cat-back system with muffler, the Large Bore-HD exhaust strikes the perfect balance between performance, fitment, and value. Smooth transition bends minimize turbulence, allowing exhaust gases to flow efficiently while supporting improved throttle response and engine efficiency under load.
A free-flowing 24-inch performance muffler is integrated to absorb high-frequency exhaust tones while producing a deep, aggressive diesel sound. This tuned design unleashes available power without excessive rasp or harshness, making it ideal for both work and performance applications.
Installation is quick and hassle-free thanks to factory mounting locations, OE-style flanges, and high-quality band clamps, which provide a secure, leak-free 360-degree seal. OE-style bayonet hangers maintain precise exhaust alignment under high heat and vibration, ensuring a long-lasting factory-quality fit.
Proudly engineered and manufactured in Corona, California, the Large Bore-HD exhaust system delivers proven performance, rugged durability, and dependable fitment for GM Duramax HD trucks.
Key Features & Benefits
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4" mandrel-bent 409 stainless steel cat-back exhaust system
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Increased horsepower and torque
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Reduced exhaust gas temperatures (EGTs)
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Free-flowing 24" performance muffler
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Deep, aggressive diesel exhaust tone
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Smooth mandrel bends for maximum flow and low turbulence
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OE-style flanges and band clamps for a leak-free seal
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Factory mounting locations for easy installation
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OE-style bayonet hangers for secure, long-term fitment
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Designed for extreme duty and heavy-use applications
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Made in the USA
Vehicle Fitment
Chevrolet
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2006–2007 Silverado 2500 HD | 6.6L Duramax Diesel
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2006 Silverado 3500 | 6.6L Duramax Diesel
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2007 Silverado 3500 HD | 6.6L Duramax Diesel
GMC
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2006–2007 Sierra 2500 HD | 6.6L Duramax Diesel
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2006 Sierra 3500 | 6.6L Duramax Diesel
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2007 Sierra 3500 HD | 6.6L Duramax Diesel
