Updated the Y-Pipe to the '96 version with in line cats and needed to relocate the O2 sensors. The '93 is a mixture sampling system with O2 both before the cats and the '96 is a before/after system that monitors the levels into and then out of the cats.
Many have just deleted the P.A.I.R. system and used the unused ports for the O2 sensors; I wanted to leave the emissions system in place so new O2 ports were needed in each down pipe.