GM E41 ECM Services (L5P)

Get your 2017+ Chevrolet Silverado and GMC Sierra 2500/3500 6.6L Duramax ready for tuning! Choose one of three options to upgrade your L5P E41 ECM for tuning: Purchase, Exchange, or Upgrade. Shipping address for ECM Exchanges and Upgrades: Warranty Killer Performance (ATT: L5P ECM Service), 220 Aero Drive, Shreveport, LA 71107 USA ECMs with broken “LOCKING” tabs or connectors WILL NOT be accepted for Upgrades and Exchanges.