I ran Michelin Pilot Sport All Seasons on my C6 and they were a great street tire. You might want to get an alignment. the roar is usually caused by uneven tire wear on the inner edge due to toe out of specs.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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