The PPEI Engine Tuning (PP-LB7-ET) for 2001–2004 Duramax LB7 trucks boosts horsepower, torque, throttle response, and drivability while maintaining reliability. Developed by Power Performance Enterprises, Inc. (PPEI), it addresses factory limitations, optimizes fuel delivery, refines transmission shifting, and can improve fuel economy. Offering customizable options for towing, daily driving, or competition, PPEI’s tuning is a trusted choice for Duramax owners seeking enhanced performance and support.