The Gen3 intakes do affect sound tone in various rev ranges, esp for passengers and people outside who are beside/forward of the car, but not really overall volume much. From the rear any change from the intakes is drowned out by the exhaust.
If you're looking to cruise in style in a roadster, you probably don't want headers or testpipes on the car for all of the reasons mentioned above: excessive noise, dangerously horrible exhaust fumes, etc. You wouldn't be happy. Just slap on the G3 intake and a nice catback exhaust, maybe splurge for HFCs if you want a little extra kick.
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