If tuned properly; you can run HFCs with no CEL. Really it comes down to what you want as far as the sound. Im currently running the full motordyne system (Headers and HFCs) and my car has all of the readiness monitors enabled and passing on flex fuel.
Anyway, you will need a retune if you remove the stock cats. Honestly, you can make good power with the advancements in the ECUtek software on stock cats. Get yourself a quality catback and enjoy it!
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