Do I need new gaskets or studs when I install this?

You'll need fresh header gaskets — reusing old ones is asking for leaks. Studs on the engine side are typically reusable unless they're damaged or corroded. Grab a gasket set when you order.

Does this header need to be painted or coated before bolting on?

Stainless doesn't rust bare, so painting is optional. If you want a finished look or heat shielding, ceramic or high-temp paint works. Test-fit first before committing to any coating.

Will this fit my current exhaust setup, or do I need a new downpipe?

The header outlet diameter determines downpipe compatibility — verify your existing downpipe matches before purchasing. Header alone bolts to the engine; everything downstream is up to your current system.