Can someone identify these mufflers?

[ThatsGuy]

Gday, my ute has pacemakers into twin 3" pipes, with these mufflers at the end.

Any idea of the brand?

Thanks!

Is there a particular type/name for the joint back should I wish to grab a muffler-less or just resonated part from the last joint back in case I do a track day? Is there any power to gain at all? I guess I could just take the mufflers off completely but I don't know if this would gain anything, might even not match the tune?

I've found 'bolt on end pieces' etc on eBay/online but usually only 2.5" and not sure of shape to match.