Boost gauge should tell u if there is a vac leak. watch it on idle. i also get that sound in my volvo every once in a while and i have double/tripple/quadrouple checked the couplers and its just the way the air flows through the ic couplers. unless u are having eradic boost or slow boost build then it shouldn't be anything too major to worry about (i.e. turbo going out/ wg problem).
usually if i have any issues its because a teeny tiny lil vac line has come lose. check all those lil guys
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09 370Z ST 6MT//Injen CAI//Greddy CBE//TP//TSW's//Swifts//Stillen lip//Whiteline sways
326whp/268tq
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