If you're way too rich they'll fail sooner. I have a predator (only used for scanning now) and have never been a fan. Dyno tune or wideband and HP tuners is the way to go. Have you ever had your AFR monitored?
[2004 GTO PBM A4
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2011 Corvette - Torch Red - A6-- Cam, Headers, Exhaust
2013 Ford Focus - Grey Metallic