[RICK LAKE]

Calbullet I am running a wide band FAST system. As long as the O2 sensor is at around 800f you should get a go O2 sensor reading. You should mount the sensor in the collector where all the exhaust meets. This way you get the average gas from all 4 cylinders and not just 2 cylinders. Some FE cylinders run leaned than the others. I have my O2 on the inside of the pipes and at a small angle going up. It should take 2-3 minutes to get enough heat to the sensor to start varying the readings of lean/rich. I do have my header pipes rapped to keep the heat in, they are hot coated also. This may make the differents in heat range of the inside exhaust gases. Rick L.