My Z had a Borla on it when I bought it. I like it. It is definitely louder and deeper than stock. With stock cats, it is mild. I found with the ART pipes, it had too much drone. Sounded really nice WOT,but around town driving was a bit much after awhile. I swapped out the ART pipes for FI RHFC and found my sweet spot.
Here are some comparison videos. I don't have any with the FI cats.
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NISMO R Tune Intakes \ Fast Intentions RHFC \ Borla CBE \ EcuTek Tuned\ SPL Camber Arms \ Powertrix Coilovers \ Swift Springs \ Avant Garde \ Wicked CAS \ Morimoto XB Halos \ Custom Fenders \ Hotchkis Sways \ NLP Splitter
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