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The reason your car drops to 500rpms on shift is because your bov is venting air that has already been metered, out to the atmosphere. When you do this your ecu tells the injectors to put more fuel in then is actually needed and the car will overly richen for a second causing the motor to bog. You need to either, recirculate your bov behind the maf or run a blow thru maf. Whether you realize it or not, even when you think you aren't boosting your bov may still open a little when you shift due to the sudden pressure change.
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