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if you put in a downpipe in place of the stock CAT but the downpipe still utilizes the factory o2 sensors will it set the check engine light off. im pretty sure it does but i dont no and if it does do i just have to get one of those MIL eliminators and ill be set? and do i need only one for the o2 sensor that would be after the CAT or do i need one for each o2 sensor. Ohh yeah one last thing when u use the MIL elimanator the o2 sensor is still functional correct? like it still sends infor to the ECU to control ur Air/Fuel ratio.l I know thats alot of question but i just cant afford to make any mistakes thanks for the help guys
 

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You only need the O2 cheater for the downstream sensor...if you put one on the upstream sensor, your engine will think you're running super lean and will make the A/F ratio waaaay too rich.
 
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