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Old 09-23-2020, 03:28 PM   #3
Scooby Newbie
Member#: 518805
Join Date: Sep 2020
Location: Michigan, USA
2006 Impreza WRX
Steel Grey


Originally Posted by JarHarms View Post
Your primary O2 sensor in the up-pipe (pre-turbo). The secondary O2 sensor is after the rear catalyst in your factory downpipe. There should not be any sensor bung on the turbo outlet section on a factory USDM downpipe. If one is there then it would have to be a JDM, aftermarket, or modified downpipe. If there is a bung located there and would be a location to add a WBO2 sensor.
If you replace the downpipe on your 2006 you will need tuning to avoid setting any faults. Personally I would opt for a downpipe that has the additional bung for a WBO2 since tuning is involved. Catted -vs- non-catted is your preference and opinions will vary widely on this. Catted will cost more, avoids some minor exh odors, is still non-compliant, and will not save the dolphins as some believe.

...and this does not belong in the interior/exterior mod section...
Thank you for responding, This did help. Also I am new to the forums and thought that it would go with exterior mods, sorry. For next time where would a question like this go?
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