Figured I'll post in here with my experience and update it every so often. It seems lots of people have issues with this intake.
So far I'm at around 1500 miles with this intake, a Grimmspeed Turboback/boost controller, TGV/EGR deletes, and FMIC. Protuned at 284whp/300tq on a Mustang Dyno.
No issues at all with my fuel trims. Do a 3rd gear pull onto the freeway just about every day. Multiple datalogs look great.
When I originally got the intake and used the OTS map with it, the fuel trims were all over the place and I was knocking at WOT consistently. Took it off and waited for the rest of the stuff for the protune.
It seems people have issues when they clean/adjust their filter. I'll update when I get to that point but so far it's working great. I think issues pop up with more aggressive tunes/e-tunes.