I thought I've seen something on this before but I didnt find anything when I searched....Is there any way to trick the car into thinking the second o2 is hooked up? Also when putting a header on my HX, what am a spose to do about a cat?

 

UDED A CHEQUE VALVE

 

what? does anyone have a write-up or a explination on how to do this and all the parts I will need.

 

If you are putting a header on an HX, you will need the EX header, EX cat, and EX cat-back. Then you will need to extend both o2 sensors.