Upgrading the stock cats to either HFCs or TPs will certainly make you happy. It'll make your 4-6k RPM range come alive with a little growl. That being said, unless you're happy with a "6-7 out of 10" on the loudness range, you'll probably end up replacing the CBE as well. The car dramatically changes once the cats and CBE are upgraded, in terms of power and sound.
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"Any man who can drive a 370z while kissing a pretty girl is simply not giving the Z the attention it deserves." Albert Einstein....modified.
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