A factory hard top will make the car a little bit quieter. At least it does on my 2003 S, whose soft top has an inner headliner and a glass rear window. But I don't know how noisy your tires are. I have Michelins and don't have excessive tire noise, whether I'm running with the top down, soft top up or have the hard top on. I think if your tires are too noisy with the soft top up then a hard top isn't going to make that go away.
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