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 .
Guys, I'm a newbie with Turbo. I sent my Frontier for service lately and after service the mech told me that my turbo is having problem. There's a slight sound I think is 'clicking sound' from the turbo and he told...