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 .
As per the topic, A buddy of mine and I are planning in purchasing a vr4 rs half cut to quench our need for replacement parts. My buddy ( the infamous hantu with broken block :lol: ) is actually seeking a...