[steve00s]

I do not believe your CEL's are caused by the removal of the secondary cats. Those are downstream from the sensors and should not result in CEL's. The deloboz header has only one O2 bung per header (positioned towards the rear of the header), if I am not mistaken, and this is probably what is causing the problem. You could try having another bung welded towards the front. Maxspeed sells headers on Ebay and you can see from the pictures where the placement of the bungs are (they have two bungs per header). You can also puchase an extender piece that screws into the bung (put in the second bung) and pulls the sensor back out of the airflow slightly. These sell for about $20.