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i was told that i would not need the o2 sencer with the decat pipe, the o2 goes right into the catalytic converter and i dont know whether not having it will affect the way that it runs or if it will stop it from running at all... any tips?
 

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the sensor in the cat is not an O2 sensor, your O2 (lambda )sensor is in the turbo elbow

the sensor in the cat is a heat sensor to tell when the cat is over heating, it's not needed in the decat pipe and is best tucked away and cable tied out the way
 

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possibly, but depending what decat you get it should have a screw in area, so it stays connected and working
 

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I had to cut mine off because it was siezed solid into the CAT. Didn't make any difference driving the car and the light doesn't come on. :grinno:
 
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