:uhh: so i order my cat back exhaust and the pipe replacing the OEM catalystic comes with a port for the 02 sensor wich is fine, but my OBX headers has the same hole for the sensor, what should i do??? use only one sensor or does the car comes with 2 sensor 1 in d catalystic and one in the exhaust manifold, anybody ???help

theres 2, one before the cat (for the headers most likely) and one after the cat (for the replacement pipe)

never looked under there before?

no man i just got my headers and exhaust today and i was just wondering, thanks anyway i aprreciate your help.....

if u dunno about that ... I hope you dont mess anything up.

I recommend a new sensor rather than trying to swap the one from the OE manifold, more often than not the original O2 sensor threads are seized and you'll damage it trying to force it out