Do these need to be painted or coated before installation?

Stainless steel headers don't require paint. They'll develop a natural patina over time from heat cycling, which is normal. If you prefer a polished or ceramic finish, that's a personal choice — but it's not necessary for function or protection.

Will I need new gaskets or fasteners when I install these?

Factory gaskets should be replaced with new ones during installation. Bring the headers to a torque wrench and gasket set when you're ready to bolt them up — standard engine work.

Do these work with the stock exhaust system?

Yes, these connect directly to your factory exhaust manifold outlet. No adapters or modifications needed downstream.