Couple of thoughts;
Does it go away when you push the clutch in?
Open the hood and have someone rev the engine, turn the AC on and off.
Doesn't sound like PS, but give the steering wheel a turn in each direction.
Is it coming from the engine compartment?
Almost sounds like a fan, bearing, alternator, pump..
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2016 Sport 6sp Deep Blue Pearl || AAM intake || FI TDX non-res CF + HF-Cats || TEIN MonoSport w/EFDC-II || Hotchkis sways || Z1 34 row oil + ps cooler + diff cover + oil pan spacer || TWM Short Shifter || SPL everything || MA-MS diff cooler || Stillen brake duct || ++
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