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blowing or hissing

  1. Blowing/hissing noise on throttle blip

    Alfa 159, Brera & 946 Spider
    Hey guys. when i blip the throttle on my 159 there is a hissing noise coming from the intake. Also as the car is turned off there is a blowing noise coming from the same area. The hissing doesnt sound internal. Anyone have any idea. Local mechanic says its normal.