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I went from an 86 coupe to a 997 coupe and the difference in engine noise is drastic. I had to make some modifications to the exhaust and intake just so I could actually hear the engine. I got Fister mufflers and capped the airbox resonator and now it has a nice sound on acceleration but it's still relatively quiet with the windows up and plenty comfortable on long drives. If you're looking for it to be as quiet as possible you could just stick with the stock 997 exhaust which IMO can barely be heard.
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