Well, I am brand new to this forum, I have a 05 STI with headers, up pipe, down pipe and NO CAT, the car also has the computer set at stage 2 with a COBB remapper...here is my problem. I have already replaced the Map sensor, via code, but I still have a code that tells me to replace the front 02 sensor, I am still running both front and back 02 sensors. I have not done that as yet, because I am not running a CAT, and that is the way I would like to leave the car. I have been told that running the car with no CAT will just keep burning up the 02 sensors, but I find that hard to believe. Is there anyone that can give me some help??? Really all that we are talking about are voltages, but I do not know the return voltage on either 02 sensor. I really do not want to put the CAT back in, because I am running a 3" JDM type all the way back and having to put the CAT back in would be a pain...of course it would not been any pain like changing the clutch like I did this past week-end and if any one needs help with that let me know. How about it ANY HELP?????