Originally Posted by Master Yodub
What year is your car? The 94-95 has the O2 sensor in the collector area of the header. The 96-01 has 2 O2 sensors...one in the collector area of the header, the other in the rear portion of the catalytic converter.
Unless it is a 96-99 GSR with the longer cat and then it would be in the front portion of the cat before the catalytic matrix.