If the front 02 sensor helps control A/F ratio and you throw more air into the manifold, wouldn't that make for a "lean" condition or at least make the sensor look at it that way?
If the USDM ecu isn't calibrated for it, it might throw off the sensor. Then again I don't know where the front 02 sensor on evos are located so if this is wrong entirely ignore me.
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For mitsu to have the system on a stock car the intake pressure must be more than the pressure in the exhaust manifold at that time.
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I would think that this wouldn't be a problem seeing as the hotside is constantly sucking the exhaust up and when you are boosting the intake manifold is positive pressure. If anything I would think the exhaust manifold would be closer to vacuum than the intake manifold.