The cats are the most restrictive part of the exhaust, so swapping those out will get you the best gains. Are you planning on installing this stuff yourself? The "demon bolts" on the cats are a bit of a pain.
And FWIW, both the Fast Intentions HFC and Test Pipes have J-Bend style extensions for the sensors, so they're not supposed to set off the Check Engine Light. That being said, I have FI test pipes and catback, and I set off the CEL every few weeks. That's nothing that a $20 code reader from Amazon can't fix, though.
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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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