The more support the 1.8 guys can get the quicker they'll stop crying.... J/K!!!lol That would be awesome if you could organize a real header for the 1.8. What shop will be building it? Are they a large shop or just someone local?
Also, I think you shouldn't delete the O2 bung, I would highly recommend leaving it in the normal place like ZZP has done with the 1.4t down tube. You will need tuning (and I'm not sure if they can just kill the sensor all together or if they just ignore the signal but allow the car to know the sensor is still present which could cause other problems) which you will want with a header anyway, Trifecta can just disable the O2 as they do on the 1.4's already.
