Do I need new gaskets when installing this header?

Yes. Reusing old gaskets risks exhaust leaks. Grab a fresh header gasket set rated for your Accord engine size before you bolt this on.

Will this header work with my stock exhaust system?

It bolts to your factory collector and exhaust piping. You can run it stock-matched, but many owners pair it with an aftermarket cat-back for full flow benefits.

Does this need painting or ceramic coating?

Stainless steel doesn't require coating, but it will develop discoloration from heat over time. That's natural — it won't rust or degrade. Polish it if you want the shine back.