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      04-09-2012, 01:08 PM   #128
uhmenono
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Drives: 2009 m3, 2015 m4
Join Date: Jan 2012
Location: las vegas

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What HFCs and fabspeed tried to do was to clean up the airflow to the sensor. This intercepts the O2 sensor and reduces the voltage going back to the ECU, acting like the correct sized cat is in place.
I will be putting on another 1000 miles this week and a track day this weekend, so will see...