I'm swapping a GSR into my EG (VX). I'm planning to convert my VX harness for the GSR and I've noticed the GSR have two 02 sensors - one in manifold and one in cat. Can someone clarify if I need both 02 sensors or will I get away with one to pass smog. Pix would be nice on where to hook up the 02 sensor and how did you plug up the other 02 opening?