As others have already said, the pieces you are looking for are either High Flow Cats (HFCs) or Test Pipes. On a non-FI'd car, the test pipes will generally get you a few more HP vs. the HFCs.
I will be ordering my exhaust set-up soon, and plan on going with Fast Intentions resonated test pipes and Fast Intentions TDX Catback with 18" resonators.
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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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