I don't have flow rites or the slp intake. I have JC Customs intake, which is a vent in the top of the gauge pod with a vent in the upper airbox and 2 2.5" holes behind the carbs, with a prefilter screen on side panel. Have never experienced any bog.
yeah lower air box...behind the carbs. But you need (should) also be adjusting your fuel as you are freeing up airflow. More air - more fuel.