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Originally Posted by dayofpain
alot of the sensors in the subaru are through resistance grounding. ie. current goes through a sensor and the ecu monitors the resistance to ground. so by getting things as close as we can to zero, the ecu will be more accurate.
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I was thinking about this some more... And assuming the base maps, for everything are based on the stock grounding resistance, better grouding may cause those maps to be off. Take the MAS, or 02 sensor for example. A better reading might well confuse the ECU, at least with stock maps. I wonder if the car actuaally feels stronger because it has leaned out ever so slightly?