FWIW, I have the FI resonated test pipes and their catback w/ 18" resonators, and I've had the CEL come on a few times.
I had everything installed last spring, and I had the CEL come on maybe 3 or 4 times that summer. When I brought the Z out this Spring, I had the CEL come one 2 or 3 times in the first few weeks. That was back in March, and it hasn't come back on since (knock on wood). I just use one of those cheap code readers from Amazon to clear them out.
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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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