A friend of mine has assembled an 07 LMM with a new ECM. Can I reflash his ECM with a stock tune out of the library and get it breathing? I can get an OS # off the ecm but its nowhere near the stockers in the library. Also is there a way to get efi live to talk to the body control module? Does the BCM have to be reflashed with the ECM via dealer to make everything happy? Thanks in advance for your advice and input!! RR