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basically every time the blowoff valve actuates its dumping metered air from the mass air flow sensor to atmosphere. the ecu doesnt realize this and is already sending enough fuel to the cylinders for the air thats escaped. this will result in an "instant rich" condition. unless u convert your engine management to MAP based tuning leave the stock bypass valve in place
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2004 Subaru WRX STi - built. 344hp/346tq Moon Tuned
1995 Saturn SC1 - beater.
2006 Honda CBR 600RR - totaled.
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