I asked the same question to FI about their catback before I ordered my stuff. They said that the NISMO dynos about 4-6 RWH higher than the base model.
I have a '12 NISMO, and I upgraded my exhaust to the Fast Intentions Resonated Test Pipes and their catback with 18" resonators. I didn't do any dyno runs, but the car feels more peppy and responsive.
I'm sure there are others with actual dyno sheets to prove the gains, but the gains are there.
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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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