Agreed. Almost every aftermarket exhaust is going to be measurably, if not significantly louder than your OEM Nismo. I had the Nismo myself for a month or two before ditching it for the Stillen. I'm very glad I did...perhaps you should too. 
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2010 6MT PG Roadster w/Sport & NAV.
Stillen Exhaust, Stillen GIII Intake, Eibach Springs, H&R Spacers 15f/20r, SPC Rear Camber Kit. Thanks to Vinny Ten Racing!
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