Will this bolt straight to my stock catalytic converter?

Yes. This is a catback system, so it connects directly to your existing cat. No modification to emissions components needed—bolt up and go.

Do I need a heat shield or mounting hardware beyond what's in the box?

The assembly comes complete. Inspect all mounting points during install to confirm fitment; if any hangers or brackets don't align, you may need minor bracket fabrication or adjustment.

Is the stainless finish polished or brushed?

Finish type not specified in the product data. Contact support with photos of the product page if you need clarity on appearance before purchase.