bootsmorris
October 22nd, 2025, 04:03 AM
Good morning all!! I am very new to tuning, especially diesel tuning. I have a 2007 5.9 Auto pickup. The only mods are an intake and 4" exhaust from turbo to tip. I am looking for a CM849b file so I can start playing around with the software. I can find lots of files for my year and engine and trans, but they are all CM849 ECU. Is there enough of a difference to worry about, or will a file for CM849 be ok?