Will this bolt straight to my factory catalytic converter?

Yes. This is a catback system, so it connects at the catalytic converter outlet and runs to the rear. You're bolting to an existing connection point—no welding or modifications needed.

Do I need to remove or replace my factory heat shields?

Test-fit the system before final installation. Some factory heat shields may need to be trimmed or repositioned depending on your exact vehicle configuration. Have basic hand tools ready and give yourself time to verify clearance.

Can I polish this stainless steel to make it shine, or does it come pre-finished?

Stainless steel can be polished if you want added shine, but it doesn't require it. The material is already corrosion-resistant as-delivered. Polish is purely cosmetic.