So today I have finally gone Stage 2. I have a 2004 WRX with a Cobb Short air intake, catless up pipe, catless 3" turbo back and tuned with the Cobb AP v3. Now note, I have no catalytic converters in my car. Also, I didn't reconnect the o2 sensors in the up pipe or down pipe. After turning on my vehicle for the first time after the stage 2 upgrade, I got the P0037 CEL about 2 minutes into warm up idle. Now I'd like to assume this is due to the fact that I didn't reconnect the up pipe and down pipe o2 sensors, but I just wanted to make sure.
BTW for those who don't know, P0037 CEL = HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
Thanks for the help in advanced!