How to polish a 409 stainless steel exhaust system

Polishing a Flowmaster 409 stainless steel cat-back exhaust for the 99-04 Mustang Cobra. This exhaust will be installed on my IRS swapped 2001 Mustang Bullitt.

[@RJon2006]

Thank you posting this. I hand sanded my IRS 409 SS exhaust and it was better but nothing near what I want. I need an electric sander and go through all these steps again. Appreciate it.

[@BetterBucky2011]

Nice job. Just curious if this has held up, 409 usually has a tendency to form surface rust.