Use a little anti-seize on the threads, but do not get any on the probe of the sensor. Install the factory O2 sensor in the rear bung of the COBB Downpipe.Using a 22mm oxygen sensor wrench or socket remove the stock O2 sensor (This may also be a good candidate for some penetrating oil).If you're having a hard time you can remove the rear piece and remove it in two sections. Now that the downpipe is completely loose you should be able to remove it from the car with a little wiggling.Disconnect the rear O2 sensor wiring harness from the connector attached to the transmission.Remove the spring bolts holding the downpipe to your cat-back.On some vehicle there may be additional heat shielding preventing access to the bolt, these can be removed. This bolt is not used on the COBB downpipe. Remove the 14mm bolt holding the downpipe to the transmission under the car.Save these as well as the bracket that held the heatshield for reuse with the COBB Downpipe. Using a 14mm wrench remove the two 14mm nuts and bolts as well as the three 14mm nuts attaching the downpipe to the turbo.Allow it to sit for a reasonable amount of time before removing. Apply penetrating oil to the bolts on the downpipe.
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