Find high-quality parts and upgrades specifically designed for the 2004.5–2005 LLY Duramax 6.6L diesel engine. From performance upgrades to essential maintenance components, our selection …

Sep 6, 2022 · What are the best Duramax LLY performance mods? Learn about our favorite LLY upgrades including intakes, exhaust, tuning, and more.

Whether you’re looking for injectors, performance tuners, exhaust systems, or suspension upgrades, we’ve got you covered. Our team of diesel enthusiasts has carefully curated our selection of 2004.5 - …

Welcome to the ultimate destination for Duramax Performance Packages! Whether you're an enthusiast of the classic LB7, LLY, LBZ, LMM models, or the more recent LML and L5P variants, we've got a …

We’ve got everything you need to repair and upgrade your 2004.5–2005 Chevy/GMC Duramax Truck. Select one of the categories to view the full line of products, learn more about specific LLY Duramax …

What sets us apart from other shops? Simple, at Powerhouse Diesel our mission is to earn our customers trust. We want you to have the best parts for whatever budget you may have. Whether it …

Browse performance parts and upgrades compatible with the Diesel Duramax LLY engine. This page groups products designed to fit applications using the Duramax LLY platform, making it easier to find …

Dec 14, 2025 · This guide highlights five targeted upgrades that are well-regarded for the LLY platform, focusing on installation compatibility, performance gains, and durability in everyday and towing …

Nov 19, 2025 · Discover why diesel fans love the LLY Duramax. FASS Motorsports explains its history, reliability, power, common issues, and upgrades that make the 6.6 LLY a favorite among Duramax …

Shop performance and OE-grade replacement parts for every Duramax generation: LB7 (2001–2004), LLY (2004.5–2005), LBZ (2006–2007), LMM (2007.5–2010), LML (2011–2016), L5P (2017–2025).