There is a device you can get that either plugs into the O2 sensor or taps into the wiring that fools the ECU into thinking the sensor is reading within specs. I forget who makes it, but if you do a Google search, you may find it. Try typing "O2 eliminator", or Oxygen Sensor Eliminator." My friend has one on his RSX Type-S, the Comptech Race header has no provision for a cat, much less an O2 sensor, but like I said, I forget who makes it. Good Luck.