Hi. New to the group and this will be my first time tuning. Im running a LQ4 in a suburban 2500 using the 2003 trans. Everything is bolted in but just need fuel lines and tune. Im using LS droid and TunerPro. So I downloaded the OS and it is 12579405. From what I've read is that there isn't a XDF for it yet. Anyone have any updated info on this? Thanks.