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I see you've eventually chosen the platinum plugs, but I want to recommend upgrading to iridium plugs for users who will read this thread in the future.
Stock HEMI plugs are NKG's copper LZFR5CI-11 that run for about 30k miles. Platinum plugs run 60-80k and iridium is good for up to 100k miles...
From what I've found if you're doing well over 400HP you surely need an exhaust upgrade. But a dual-pipe system isn't worth it: in my opinion, equal-length headers with a bigger single pipe in stock place is a way better
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