NC (Auto) back box replacement options

[Rustingslowly]

Hello - I'm a new NC owner with a huge grin generated by my new drive.
But... I want a bit more sound from my daily driver NC - 1. It's an auto (my bad knee is set off by using a clutch) so I am mindful that the wrong choice will sound horrible. I'm not after HP gains but would just like a bit of sound to drive to.
It looks like I'm starting at $2000 if I can find someone that can deliver to NZ, and that feels a bit to much for no performance gains (not that there's a huge point going for performance with an auto).
I thought I saw on a forum that someone found a particular Holden muffler added a bit of base and a bit more sound, but I can't find that post anywhere.
Has anyone found a good NZ solution?