Don't remove the sensor clips of the JB4 itself, just OBD. You just have to pull real hard, it'll come out. Maybe give it a bit of a wiggle.
Set to Map 0 before the inspection. This is pass-through mode on the JB4, and it basically won't do anything. Just sitting there passively.
@Jesse DaBears mentioned he runs 1FS already, but that is true and it's definitely a legit site.
Downpipe is catless, and 100% will throw an ignorable CEL.
They're completely different products with completely different use-cases. XHP tunes the transmissions, and JB4 is a boost controller with some extra features.
I'm still saying that XHP isn't ready. It behaves so crazily on the drag strip, it's hard to recommend. I know that most people aren't...