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After doing some more research i found this...
"OBDII cars have two oxygen sensors to measure the amount of oxygen contained in the exhaust gas. The first sensor is located on the manifold or header and measures O2 content of the exhaust as it escapes from the cylinders. This sensor is used by the PCM/ECM to calculate fuel trims and look for combustion problems. The second oxygen sensor is located after the catalytic converter and is used only to measure catalytic?converter efficiency. The PCM/ECM does NOT use any data from the secondary O2 sensor for engine management. The PCM will set an CEL(check engine light)/SES (service engine soon) / MIL(Malfunction Indicator Lamp) light?if the catalytic converter is removed, the sensor is removed, or the sensor goes bad."
Can anyone confirm this? I am hesitant to get a header because i dont want to mess up my fuel economy, so i am weighing out all the options. If this is true then i have nothing to worry about, since the 2nd o2 sensor just detects the efficiency of the cat... Has anyone experience any drop in MPG since installing headers on their 2.5?
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