Sounds like you're concerned about noise. I would think HFC or headers would def increase the noise dramatically.
IMO after a CBE and HFC combination, you're really at the "return on investment" threshold as far as bolt-on performance mods go. If F.I. is out of the question but you don't care about dropping some coin on other mods, then go ahead and continue but the gains aren't worth it for a dd. Just my .02.
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