I've got a 2012 NISMO, and I just had my FI exhaust (resonated test pipes and 18" resonated catback) put on last week. It's louder than the stock NISMO, but it's not obnoxious. So far, I'm very happy with my decision!
In terms of differences, the 2013-14 model years also had darker wheels.
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Current Ride: 2012 Nissan 370Z NISMO #0389
Mods: Fast Intentions Resonated Test Pipes and TDX Exhaust with 18" Resonators (#1054), K&N Drop-Ins, GTR Start Button
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