Forum: 2001 - Current Chevrolet & GMC 2500HD/3500 Light Trucks

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  1. Welcome to the Internet's first Duramax 6600 diesel discussion forum for the LB7, LLY, LBZ, LMM, LML, LGH & L5P RPO code engines. Tips on performance, fuel economy, troubleshooting and more.

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  2. Discussion Forum for the 2001 & newer 2500HD/3500 Trucks, Transmissions & Drivetrain

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    • Threads: 4,889
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  3. What's it take to make big power? Tips on Duramax diesel performance products, improving fuel economy, power upgrades, exhaust systems, and programming. From a little to a lot, find out what it takes. Post a question or offer your advice.

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  4. Engine, Truck & Drivetrain Accessories

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