okay i have a 14b turbo with hf manifold for my dohc zc. i'm getting a o2 housing from a dsm for the 14b turbo and it's ported 2.5 which is the diameter or w/e of my downpipe, how and i suppose to connect the o2 housing to the downpipe? if i weld it, my friend says it might crack. so i'm looking for alternatives or something. thanx for help.

 

roadraceenginearing, sells a flange that will mate to your o2 housing

here is a picture of mine with the flange welded on

 

So does wierRacing....