Headers or High flow cat

So I guess I’m somewhat dumb when it comes to this but I was expecting to have my pick of the litter when it came to high flow primary cats. Not the case

My current set up is main cat. Deleted second cat. Stock resonator. No muffler.

Well my cat is fouled out so I wanted to replace it with a high flow (less cells to help with messing up again) but nobody really makes a high flow for the section of pipe at the manifold. Now most headers are catless so I could go that route with non foulers but I’d definitely have to add a muffler to control the noise

Any ideas or direction or high flows?
 

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