2004.5 - 2005 GM 6.6L LLY Duramax | Engine Tuning by PPEI

Elevate your 2004.5 - 2005 LLY Duramax to new limits with PPEI's Engine Calibration, an industry-leading performance enhancement that will transform your truck's capabilities. PPEI's Engine Calibrations have been meticulously crafted to unleash the full potential of your LLY Duramax, providing a significant performance boost of up to an additional 230 HP directly to the wheels. But the advantages of PPEI's tuning go far beyond raw horsepower. These calibrations redefine your vehicle’s performance by enhancing throttle response, increasing acceleration, minimizing turbo lag, and delivering an all-around refined engine performance. With a focus on optimal efficiency, PPEI's Engine Calibrations are engineered to reduce excessive fuel consumption, thus improving overall fuel efficiency. This means you can enjoy increased power without sacrificing fuel economy. One of the standout features of our LLY Duramax Engine Calibration is the remarkable impact on towing capabilities. Your truck wil