Colin is spot on. YOu dont need to remove anything else but the intake pipe from the turbo to the air box. There is a ton of room back there. I didnt cut out the brackets but the longest part is removing the heat shields for me. Took about 5 min of maneuvering. Again, not hard just takes a minute.
I'll ask Tim about the rear 02. It wouldnt surprise me if Ford did that as they have some really wacky cam phasing tables but my guess is the rear 02 doesnt do much, if anything outside of emissions. I dyno'd again and put down 254wtq this morning. Maybe we changed over from winter fuel to summer?