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i'd like to take an IAT sensor and put it in his stock airbox right at the filter and then put one inside the cone filter wherever kruppa decides to mount it and compare temps.
yep, air is flowing away from turbos when on gas and when you let off gas air starts flowing backwards and if you don’t release the air with the bov the air would make the turbo slow down with air pushing its rotation the opposite way and can damage the turbo.