actually i have no cat right now. Only for the fact that i planned to run it like that until I got my new Kteller exhaust, and didnt want to have to chop apart the 5zigen for resale.

But how would that effect my codes? I know it will throw a code for catalyist, or something. But i welded the o2 bung pretty far down the line, and extended it out so it would read less exhaust gasses. The only 2 cels that im throwing are the misfire, and the heater circuit on the secondary o2....