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Steve, whoever coated that for you didnt do a right job.. that should not be happening with regular paint after a week let alone with powdercoat.. you need to strip original tips completely.. if powdercoater doesnt have access to acid stripping then you can sandblast it completly to bare metal.. prime and powdercoat.. many powdercoaters will do it cheap and just lay powdercoat on top.. thats horrible.. thats same as rattle can over chrome..
On a seprate note, i've had same tips coated on my X5M for nearly a year with zero issues and 5K miles.. exhaust tips do not generate heat like downpipes..
Like Adris said ceramic coat is best solution but not mandatory..
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