I remember these from a few years ago looking for the red and black Corsa DB exhaust mufflers.

If you wanted to run a Corsa system for a few hundred dollars this might be a good option. It's a 4" muffler so you can run an adapter or even add 4" piping via shop or yourself if you have the skills. Maybe someone will find these useful.

Corsa universal diesel mufflers on ebay