PPE headers matched with the Tomei exhaust has been one of the loudest setups I have ever heard. If you want to tame it a little or even deepen the sound then your best bet would probably be the ART pipes. You could get away with a set of regular resonated test pipes as well, but it's not going to make a huge difference with the lower RPMs.
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'08 Infiniti G37s - Forced Induction Fed
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