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If it's not the flying saucer pedestrian warning system (sound should come from front of car though) then it's the pumps circulating oil and coolant a bit more aggressively after you supercharge.
B1ue: During supercharging, the car makes some very interesting, sometimes alarming, sounds. I've also noticed that the octovalve doesn't keep the HVAC system very stable (my car fogged up a couple of times, even on HVAC Auto). I'm assuming the software is doing an amazing dance, cycling coolant to the various systems.