Cats Exploded. Suggestions?

MoulaZ

If you're talking universal style Cats... Mil-Spec is more widely available in the US, Magnaflow are probably the best you can get in Australia.

If you're talking typical 'HFCs' in the stock location, there's a stack off-the-shelf options, though I doubt the success you'll have with them.

It's more to do with Cat location, not brand or type, in my opinion

In the Z32, Cat location was mid-system and there are plenty of F.I. Z32s with far more power than us with this setup, unlike the Z34 where Nissan decided to have the Cats up front, at the beginning of the system right after the headers.