same problem here... went to mechanic....was told could be dirty at the power steering reservoir.... mine had to clean a few times. but still the sound is still there... albeit less
no worry guy... it like tats, because it not taken care and moreover the steering fluids in locally made it worst... but trust me its OKIE... It happen to all JAPANESE car...
im using e3 engine with minor mod..juz s90 70mm throttle body, 650cc injector, emanage, and 86mm sr20 piston, toda 1.5mm gasket, hks head stud.. izit no problem wit my engine if im using ar70 gt35 turbo with standard...