they will fit in to b16a ,
The manifold are one piece type , from the top header mount to the catalys adapter ,
if this o2 sensor wont fit to your plug , you could use your stock o2 sensor .
All this while i have been feeling that my front feels kinda light and loose. i have changed new tyres, did the alignment and tyre pressure is all good. Anyone got any pointers on what i have not done or...