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If I were to use a Fmu and Maf in a blow thru setup, where would I mount the o2 sensors. On both headers before turbo? Both in downpipe? Not looking to getting my ecu tuned at this time so please no comments on why I should get it tuned. Thanks
 

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The MFR's of the wideband kit should tell you where the O2 sensors are to be mounted.

ks
 

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I don't know of any O2 sensor that could handle being upstream of the turbo. The pipes get way too hot on the turbo inlet for an O2. Even an OEM car mounts the sensors at least 2-3 feet away from the closest exhaust port.
 

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two 02 sensors?

is this twin turbo setup?
 
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