HFC's will increse the sound of any exhaust...It all depends on what's loud for you....I have the Berk HFC/CBE combo and I think its absolutely perfect...but JB1 didn't think so and took his HFC's off...I thing I can tell you though is with or without the HFC's there is No Drone...Its not as deep as the FI....You can't even tell the difference between stock and the Berk when driving normal...unless you get on it or rev past 3.5K....
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2013 Nismo Z34 / FI TT #091 / IG: @lilzilla_z34
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