I have no hiss with my berks hfc inStalled - paired with my AAM competiton exhaust setup - see signature for details- no hiss zero to no drone - but aggressive when you want it to be
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2013 370z base brilliant silver - AT -stillen supercharger kit -upgraded impeller, csf radiator,GTR injectors, walboro fuel pump, berks HFC, AAM S-line midpipe AAM S-line axleback - Z1 34 row oil cooler -stillen trans cooler, custom UpRev tune avantgarde m310 wheels
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