changing b series header

[Touge Tom]

ok for some time iv'e had buddyclub b18 header on my b20v. and i'm wanting to fit my b20 big tube header. but! i noticed on my B,C header there is 2 sensor's, one's O2 and the other got no idea? but the big tube only has 1 sensor bung. so what do i do with this extra sensor once iv'e installed the big tube's? is the other sensor for the CAT?

[infurNOS]

Is your car obd 1 or 2?

[Touge Tom]

Obd 1 p30

[bboyzell]

if your car currently only has one o2 sensor

And the new Headers have two spots for it, put the o2 sensor in the similar location
And get a bolt and plug the other hole, or install a Sensor in there for something after Market like Wideband/exhaust temp

[connorling]

I would just get exhaust shop to drill a hole and weld a nut onto ur new header, and use all the exhaust sensor.

Cheap to get it done anyway.

[Super-DA9]

to answer your question about what the second fitting is for, it's normally there for tuning purposes, like the fitting on a test pipe. an alternative to the pipe sensor that normally gets put in the tip of the exhaust, you can have a second 02 in there during tuning for more accurate results.

when you're not using it you just put a bolt in there to plug it up.