Long story short, I don't trust any of the local shops to put on my bung for the O2 sensor. All I get is arguments saying they have to put it on the bottom of the pipe cause their isnt room on the high side. When I bought it I remember reading you had to install it so water couldn't condensate and pool in the bung. So I'm going to borrow my folks mig welder and just do it myself next time I'm home. Anyone have any tips or things to watch out for?