wondered

hi all just installed a pc3 and disconnected the o2 sensor , just wondered weather you guys just leave the sensor in the header or cap it off , I still have the cat in place so im not too bothered about restriction or weight loss, guess its easier to put back to stock if you wanted , just...

Hi anyone know the method of setting up the secondary flies . I can see the adjustment screw has been messed with at some point , wondered how to check they are set correct thanks