Give your 2004.5-2005 Chevy/GMC 6.6L LLY Duramax a performance tune with Dash Mounted Tuners from XDP. In most cases, each unit comes pre-loaded with user-selectable tuning tailored to each type of driving situation. Dash Mounted Tuners are designed for a simply installation and are easily installed utilizing your vehicles OBDII port. Pre-programmed tunes are specially engineered so you can instantly improve the performance of your vehicle. Customize the performance from your vehicle with a Dash Mounted Tuner from XDP with manufactures like Edge Products, Banks Power, Superchips, and many more.