I asked Brenspeed what changes to the tune they make for the Boss intake and they said little to none. I will ask again what they change for the longtubes and how that is any different from stock headers with cat-delete pipes. I doubt it will be much different. A/F ratios are more heavily influenced at the front of the engine on the intake(MAF) side anyway.
That's my understanding as well, as long as the MAF is calibrated for the proper diameter of intake system A/F ratios should not be of concern...
Put it up on ramps/stands an remove the extensions for the front O2 sensors immediately. I would NOT drive the car anymore in that condition.
Front O2 extensions have been removed. However, the code is still popping up once tge vehicle completes the emissions readiness cycle. Any possible issues from swapping the position of the front O2 sensors, I know the LT directions stated to mark which location they were in.