Depends, I had zero hiss with HFCs and the custom Injen exhaust I sold a little while ago. It had a very large resonated X pipe which is what I believe cut the hiss down. My FI exhaust definitely hisses, I plan on wrapping the X pipe section with exhaust wrap to see if that helps.
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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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