Will this bolt directly to my factory catalytic converter?

Yes. This system is designed as a direct bolt-on axleback replacement. You connect it at the factory mounting points upstream with no modifications needed.

Do I need any hardware to install this, or is everything included?

The assembly ships complete. Check that all fasteners are present before installation, and verify your existing downpipe-to-axleback connection points are clean and free of rust for a tight seal.

Will I need to paint or treat the stainless steel before or after installation?

Stainless steel arrives ready to install with no prep required. Over time, minor surface oxidation can occur in harsh climates — that's normal and does not affect function. Polish as desired.