This All-In-One Kit is built for the 2004.5–2005 Duramax LLY platform—no fluff, no mismatched parts. Just the right tuning files, tools, and hardware to get your LLY dialed in for real work.
This All-In-One Kit is built for the 2004.5–2005 Duramax LLY platform—no fluff, no mismatched parts. Just the right tuning files, tools, and hardware to get your LLY dialed in for real work.
Whether you're hauling heavy or commuting daily, this kit delivers calibrated drivability, smoother shifts, and bolt-on components that actually fit. From file delivery to exhaust hardware, it's all in one box and ready for install.
