I've had 2 370's and both had the "pop". I believe one of the improvements Nissan made from 2009 to 2014 was sound proofing. My 2009 NISMO was certainly louder then my 2014. Both had the stock NISMO CBE. I'm putting my FI CBE tomorrow. Will post if it's louder or outside of what I already know as the standard.
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STILLEN G3 || F. I. CF Non-Resonated CBE
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