Do these headers come with gaskets and bolts?

The header assembly ships as-is. You'll need gaskets to seal it to the manifold flange and hardware for the factory mounting points — check your vehicle's service manual for the correct specifications.

Will stainless steel headers work with my stock exhaust system?

These bolt directly to factory flanges, so they'll connect to whatever exhaust you have downstream. The stainless construction handles heat the same way as mild steel, just without the rust issues.

Do I need to paint or treat the stainless before installation?

Stainless doesn't require paint or prep — it's ready to install. Over time it may develop heat discoloration or a patina, which is cosmetic and doesn't affect function or durability.