Do I need new exhaust gaskets when I install this?

Yes. Use fresh gaskets at the manifold flange and downpipe connection. Old gaskets rarely seal a second time and exhaust leaks defeat the flow gains you're getting from the header.

Will this header work with my stock downpipe?

Mounting method and connection point specifics aren't detailed — test-fit the outlet before committing. Some builders use stock pipes; others port-match or weld for optimal flow. Verify clearance in your engine bay first.

Does this require any additional hardware or brackets?

The header assembly includes the core unit. Fasteners and any heat shielding needed for your specific setup are not confirmed—source bolts and locking hardware separately to match your OEM spec or service manual recommendations.