HPTuners SOTF Switch Duramax LML Hard Parts Check out the GM E41

Check out the GM E41 ECM Service (L5P) instead

Expanded bandwidth and improved memory allow more parameters at higher speeds—comparable to a wired experience using VCM Scanner

Performance Diesel Worx custom calibrations include size selectable power levels designed for everything from stock-like operation to aggressive performance

Cutoff Wheel (Wiz Wheel)

Modified turbo(s)

HPTuners SOTF Switch Duramax LML Hard Parts Check out the GM E41Hardware 6 position rotary switch for HP Tuners L5P and Cummins (CM2450 and CM2350) Switch on the Fly OS. Please note that Diesel Switch is specific to the application you select. Diesel Switch is not universal interchangeable. Change maps at the turn of a switch. Diesel Switch by HP Tuners lets you power up from a stock calibration to one of five custom maps with the turn of a switch. Pair with HP Tuners Switch on the Fly OS for complete control and