As title states, what are the extended datastream and HPt custom features entail. I am getting ready to tune first Subaru with Hptuners. But this is a racecar, and It would be nice to turn off some dtc's like catalyst and sencondary o2 reports being a track car that is not using these functions. Will the custom features add that? Catalyst and 2nd o2 functions are greyed out in the standard file. I would like to use Hptuners rather than Opensource software if possible.