I have Invidia and ERZ HFC. Having compared side by side with someone else with just FI, mine was a little quieter...not by a lot. My combo has no drone. Compared to someone with FI plus HFC or TP, the FI combos were much louder. Bottom line, if you don't want loud, don't get HFC or TP. Having said that, Stillen and Invidia are probably two of the quieter exhausts around, and I'm happy with my setup.
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2012 GT-R Black Edition Jet Black
2010 370Z 40th Anniversary // SOLD
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