Do I need gasket material or header wrap for installation?

Header gaskets are not included — source separately based on your flange diameter and bolt pattern. Header wrap is optional but recommended for underhood heat management and longevity, especially in tight engine bays.

Will this bolt directly to the H22 head, or do I need custom downpipe work?

This header is engineered for H22 head bolt pattern. Your downpipe routing depends on your specific platform and exhaust design — test-fit to confirm clearance before finalizing mounting strategy.

Does stainless steel need any prep before install?

Stainless arrives ready to bolt. If you're applying header wrap or heat shielding, clean the exterior surface first. No painting or priming needed.