Doing a base tune for a guy who is driving a few hours to get a tune from me. i've got a spare PCM that i was going to write via offboard so we could just pop it in and tweak the tune from there. Question is . . How do i know if i have the correct os id for his car? It's an 04 gtp and i have 1 os id for that application but the list shows the following for 04 L67's
12584056
12588931
12584057
12588932
12596138
12596136

It doesn't indicate any difference for comp g vs GTP either. Are all of these os id's compatible and should work? or how do i determine which is the best to start with?

any guidance is appreciated