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Perrin CAI actually drops midrange power slightly for a higher RPM bump. Drop-in and inlet tube (or even just the drop in) will get you just as far for a DD. But neither of those things will produce a noticeable power gain really. Getting an OFT tune would do more and not have a CEL.
The Perrin catback is a nice piece that sounds great though. I would say get a Perrin drop in filter, catback, and an OFT. Then if you still want to clean up the engine bay get the Perrin inlet tube later on.
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