Do I need hangers or brackets to mount this?

The system uses factory mounting locations on your truck. Confirm your existing hanger points are in good shape before install — if they're bent or missing, you'll need replacements sourced separately.

Will this bolt directly to my stock catalytic converter?

This is a catback system, so it connects downstream of the cat. Your existing cat converter stays in place. Test-fit the connection before tightening to make sure alignment is tight.

Does stainless steel need any prep or coating before installation?

Stainless is ready to install as-is — no painting, priming, or coating required. Wipe it down before bolting on if there's any shipping residue, but that's it.