2004.5-2005 LLY Duramax Engine Tuning | EFI LIVE | PistonTwistin

LLY Duramax EFI Live Tuning Kit – Complete Custom DSP5 Solution Built by PistonTwistin | 2004.5–2005 Duramax Take your LLY Duramax to the next level with our all-in-one EFI Live tuning kit—designed to deliver maximum performance, improved drivability, and dependable towing power. Whether you're daily driving, towing heavy, or chasing horsepower, this plug-and-play custom tuning solution is built around your truck’s exact needs. 🔧 Why Choose PistonTwistin Custom Tuning? ✅ Precision-Built EFI Live Calibration Every tune is built from the ground up based on your truck’s modifications, usage, and goals. No canned or reused files. ⚡ Power On Demand Experience faster throttle response, reduced turbo lag, and instant torque—exactly when you need it. ⛽ Fuel Economy Gains Properly tuned power increases engine efficiency. Higher horsepower often means better MPG under conservative driving. 🚛 Serious Towing Confidence Confidently haul loads over 15,000 lbs or dominate in sled pulls—we’ll