Single level tuning for the Duramax LMM. Tunes available to produce anywhere from 40HP economy/tow, 70HP Perf tow and more. While economy gains cannot be guaranteed, the economy tune has been producing very consistent mpg numbers at around 19-20mpg and sometimes more for single wheel trucks. Smooth shifting, low EGT's and more power/response than many 80 and 100HP rated generic tunes.

Installation Instructions

If you do plan to return your ECM core but need us to supply you with a loaner, please select this item. We can also program the ECM to any factory calibration if necessary. This item available for purchase ONLY with Kennedy Custom Tuning and is not available for individual outright sale. Core must be returned within 15 days unless other arrangements are made or it will be billed as non refundable.
Please note: If core deposit only is selected any future updates will require that the ECM be sent to us for the update.

If you do not plan to return your ECM core please select this item. We can also program any ECM to your factory calibration if necessary. This item available for purchase ONLY with Kennedy Custom Tuning and is not available for individual outright sale.

This item is for those who already own an EFI Live Flashscan unit, but would like to purchase tuning. It will require submission of the original tune file as read from the vehicle and the ECM serial number to be sent ahead via email. EFI Live licensing and loading of the tuning is handled by the end user.

These plugs go into the vehicle harness sub connectors to protect the terminals while the sensors are unplugged.

These gaskets are generally destroyed when removing the DPF as the heat seems to fuse them to both flanges. Includes both the 4 hole (front) and 3 hole (rear) gaskets.

These gaskets ship independently of the DPF test pipes. They can be packaged easily with Kennedy Custom ECM's etc. but not the pipes.

Order this for making changes to your custom tune file. Shipping will be additional.

Basic tune changes include passlock reset for engine swaps, speedo recalibration, factory updates, and fixing of basic Diagnostic Trouble Code issues or restoring a lost tune.

"This is not a complete tune. It does not fix P0087 issues. It is only a basic fix and requires the ECM to be sent in to us or a suitable core must be provided. We will not provide a core for this item." -JK