I have the SD headers. you need an extension for the front, I bought them from ZZP, because, although I know "some" about wiring, there was a massive debate about whether you could safely, and properly, splice in wires and make it longer. I just played it safe. I dont have a CAT anymore, I connceted two spark plug non-foulers (10$ from Napa) and put the rear O2 back on. $5 o2 cheater/non fouler how-to - evolutionm.net

or buy the emulater. your choice. My car ran like **** without the rear O2 in