ceramic coated would be best, but for a DIY, I would go with VHT ceramic spray paint. I powdercoated my muffler back with regular powdercoat to see how it would hold up, and it burnt off of the piping. The muffler and tips are great, but the actual piping between them didn't hold up to the heat.
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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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