its pad deposits on the rotors, very common. I would go with brake cooling ducts from stillen, first and foremost, then any rotors and a good sport pad for daily driving. I think the most benefit will come from the cooling ducts though.
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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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