I doubt you lost any power whatsoever, but the power increase would not be as noticeable with your other breathing mods. The hiss is definately not unique, I can't think of any exhaust I have heard on the 370z that has been able to completely get rid of it.
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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob
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